diff --git a/.github/workflows/common/set-up-mdbook/action.yaml b/.github/workflows/common/set-up-mdbook/action.yaml
index 24aaa3f6..10dc8599 100644
--- a/.github/workflows/common/set-up-mdbook/action.yaml
+++ b/.github/workflows/common/set-up-mdbook/action.yaml
@@ -11,7 +11,7 @@ runs:
       uses: jontze/action-mdbook@0765bef0c7c5792f93bf3ed3d487a0ca32c9da33
       with:
         token: ${{ inputs.token }}
-        mdbook-version: "~0.4.37" # Use a semver compatible string
+        mdbook-version: "~0.4.42" # Use a semver compatible string
         # Optional Plugins have to be enabled
         use-linkcheck: true
         linkcheck-version: "~0.7.7"
diff --git a/book.toml b/book.toml
index b81433a9..6c0e4009 100644
--- a/book.toml
+++ b/book.toml
@@ -21,6 +21,3 @@ exclude = ['en\.bitcoin\.it', 'github\.com/LibertyDSNP/spec', 'w3\.org']
 
 [output.html.fold]
 enable = true
-
-# https://github.com/jonahgoldwastaken/mdbook-external-links
-# [preprocessor.external-links]
diff --git a/theme/index.hbs b/theme/index.hbs
deleted file mode 100644
index 37f22767..00000000
--- a/theme/index.hbs
+++ /dev/null
@@ -1,312 +0,0 @@
-<!DOCTYPE HTML>
-<html lang="{{ language }}" class="sidebar-visible no-js {{ default_theme }}">
-    <head>
-        <!-- Book generated using mdBook -->
-        <meta charset="UTF-8">
-        <title>{{ title }}</title>
-        {{#if is_print }}
-        <meta name="robots" content="noindex" />
-        {{/if}}
-        {{#if base_url}}
-        <base href="{{ base_url }}">
-        {{/if}}
-
-
-        <!-- Custom HTML head -->
-        {{> head}}
-
-        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
-        <meta name="description" content="{{ description }}">
-        <meta name="viewport" content="width=device-width, initial-scale=1">
-        <meta name="theme-color" content="#ffffff" />
-
-        {{#if favicon_svg}}
-        <link rel="icon" href="{{ path_to_root }}favicon.svg">
-        {{/if}}
-        {{#if favicon_png}}
-        <link rel="shortcut icon" href="{{ path_to_root }}favicon.png">
-        {{/if}}
-        <link rel="stylesheet" href="{{ path_to_root }}css/variables.css">
-        <link rel="stylesheet" href="{{ path_to_root }}css/general.css">
-        <link rel="stylesheet" href="{{ path_to_root }}css/chrome.css">
-        {{#if print_enable}}
-        <link rel="stylesheet" href="{{ path_to_root }}css/print.css" media="print">
-        {{/if}}
-
-        <!-- Fonts -->
-        <link rel="stylesheet" href="{{ path_to_root }}FontAwesome/css/font-awesome.css">
-        {{#if copy_fonts}}
-        <link rel="stylesheet" href="{{ path_to_root }}fonts/fonts.css">
-        {{/if}}
-
-        <!-- Highlight.js Stylesheets -->
-        <link rel="stylesheet" href="{{ path_to_root }}highlight.css">
-        <link rel="stylesheet" href="{{ path_to_root }}tomorrow-night.css">
-        <link rel="stylesheet" href="{{ path_to_root }}ayu-highlight.css">
-
-        <!-- Custom theme stylesheets -->
-        {{#each additional_css}}
-        <link rel="stylesheet" href="{{ ../path_to_root }}{{ this }}">
-        {{/each}}
-
-        {{#if mathjax_support}}
-        <!-- MathJax -->
-        <script async type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
-        {{/if}}
-    </head>
-    <body>
-        <!-- Provide site root to javascript -->
-        <script type="text/javascript">
-            var path_to_root = "{{ path_to_root }}";
-            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "{{ preferred_dark_theme }}" : "{{ default_theme }}";
-        </script>
-
-        <!-- Work around some values being stored in localStorage wrapped in quotes -->
-        <script type="text/javascript">
-            try {
-                var theme = localStorage.getItem('mdbook-theme');
-                var sidebar = localStorage.getItem('mdbook-sidebar');
-
-                if (theme.startsWith('"') && theme.endsWith('"')) {
-                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
-                }
-
-                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
-                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
-                }
-            } catch (e) { }
-        </script>
-
-        <!-- Set the theme before any content is loaded, prevents flash -->
-        <script type="text/javascript">
-            var theme;
-            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
-            if (theme === null || theme === undefined) { theme = default_theme; }
-            var html = document.querySelector('html');
-            html.classList.remove('no-js')
-            html.classList.remove('{{ default_theme }}')
-            html.classList.add(theme);
-            html.classList.add('js');
-        </script>
-
-        <!-- Hide / unhide sidebar before it is displayed -->
-        <script type="text/javascript">
-            var html = document.querySelector('html');
-            var sidebar = 'hidden';
-            if (document.body.clientWidth >= 800) {
-                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
-                sidebar = sidebar || 'visible';
-            }
-            html.classList.remove('sidebar-visible');
-            html.classList.add("sidebar-" + sidebar);
-        </script>
-
-        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <div class="sidebar-scrollbox">
-                <a id="logo" href="https://www.dsnp.org/">
-                    DSNP
-                </a>
-                {{#toc}}{{/toc}}
-            </div>
-            <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
-        </nav>
-
-        <div id="page-wrapper" class="page-wrapper">
-
-            <div class="page">
-                {{> header}}
-                <div id="menu-bar-hover-placeholder"></div>
-                <div id="menu-bar" class="menu-bar sticky bordered">
-                    <div class="left-buttons">
-                        <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
-                            <i class="fa fa-bars"></i>
-                        </button>
-                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
-                            <i class="fa fa-paint-brush"></i>
-                        </button>
-                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
-                            <li role="none"><button role="menuitem" class="theme" id="light">{{ theme_option "Light" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="coal">{{ theme_option "Dark" }}</button></li>
-                        </ul>
-                        {{#if search_enabled}}
-                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
-                            <i class="fa fa-search"></i>
-                        </button>
-                        {{/if}}
-                    </div>
-
-                    <h1 class="menu-title">{{ book_title }}</h1>
-
-                    <div class="right-buttons">
-                        {{#if print_enable}}
-                        <a href="{{ path_to_root }}print.html" title="Print this book" aria-label="Print this book">
-                            <i id="print-button" class="fa fa-print"></i>
-                        </a>
-                        {{/if}}
-                        {{#if git_repository_url}}
-                        <a href="{{git_repository_url}}" title="Git repository" aria-label="Git repository">
-                            <i id="git-repository-button" class="fa {{git_repository_icon}}"></i>
-                        </a>
-                        {{/if}}
-                        {{#if git_repository_edit_url}}
-                        <a href="{{git_repository_edit_url}}" title="Suggest an edit" aria-label="Suggest an edit">
-                            <i id="git-edit-button" class="fa fa-edit"></i>
-                        </a>
-                        {{/if}}
-
-                    </div>
-                </div>
-
-                {{#if search_enabled}}
-                <div id="search-wrapper" class="hidden">
-                    <form id="searchbar-outer" class="searchbar-outer">
-                        <input type="search" id="searchbar" name="searchbar" placeholder="Type to search..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
-                    </form>
-                    <div id="searchresults-outer" class="searchresults-outer hidden">
-                        <div id="searchresults-header" class="searchresults-header"></div>
-                        <ul id="searchresults">
-                        </ul>
-                    </div>
-                </div>
-                {{/if}}
-
-                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
-                <script type="text/javascript">
-                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
-                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
-                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
-                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
-                    });
-                </script>
-
-                <div id="content" class="content">
-                    <main>
-                        {{{ content }}}
-                    </main>
-
-                    <nav class="nav-wrapper" aria-label="Page navigation">
-                        <!-- Mobile navigation buttons -->
-                        {{#previous}}
-                            <a rel="prev" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
-                                <i class="fa fa-angle-left"></i>
-                            </a>
-                        {{/previous}}
-
-                        {{#next}}
-                            <a rel="next" href="{{ path_to_root }}{{link}}" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
-                                <i class="fa fa-angle-right"></i>
-                            </a>
-                        {{/next}}
-
-                        <div style="clear: both"></div>
-                    </nav>
-                </div>
-            </div>
-
-            <nav class="nav-wide-wrapper" aria-label="Page navigation">
-                {{#previous}}
-                    <a rel="prev" href="{{ path_to_root }}{{link}}" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
-                        <i class="fa fa-angle-left"></i>
-                    </a>
-                {{/previous}}
-
-                {{#next}}
-                    <a rel="next" href="{{ path_to_root }}{{link}}" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
-                        <i class="fa fa-angle-right"></i>
-                    </a>
-                {{/next}}
-            </nav>
-
-        </div>
-
-        {{#if livereload}}
-        <!-- Livereload script (if served using the cli tool) -->
-        <script type="text/javascript">
-            var socket = new WebSocket("{{{livereload}}}");
-            socket.onmessage = function (event) {
-                if (event.data === "reload") {
-                    socket.close();
-                    location.reload();
-                }
-            };
-
-            window.onbeforeunload = function() {
-                socket.close();
-            }
-        </script>
-        {{/if}}
-
-        {{#if google_analytics}}
-        <!-- Google Analytics Tag -->
-        <script type="text/javascript">
-            var localAddrs = ["localhost", "127.0.0.1", ""];
-
-            // make sure we don't activate google analytics if the developer is
-            // inspecting the book locally...
-            if (localAddrs.indexOf(document.location.hostname) === -1) {
-                (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-                (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-                m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-                })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-                ga('create', '{{google_analytics}}', 'auto');
-                ga('send', 'pageview');
-            }
-        </script>
-        {{/if}}
-
-        {{#if playground_line_numbers}}
-        <script type="text/javascript">
-            window.playground_line_numbers = true;
-        </script>
-        {{/if}}
-
-        {{#if playground_copyable}}
-        <script type="text/javascript">
-            window.playground_copyable = true;
-        </script>
-        {{/if}}
-
-        {{#if playground_js}}
-        <script src="{{ path_to_root }}ace.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}editor.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}mode-rust.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}theme-dawn.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}theme-tomorrow_night.js" type="text/javascript" charset="utf-8"></script>
-        {{/if}}
-
-        {{#if search_js}}
-        <script src="{{ path_to_root }}elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}mark.min.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}searcher.js" type="text/javascript" charset="utf-8"></script>
-        {{/if}}
-
-        <script src="{{ path_to_root }}clipboard.min.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}highlight.js" type="text/javascript" charset="utf-8"></script>
-        <script src="{{ path_to_root }}book.js" type="text/javascript" charset="utf-8"></script>
-
-        <!-- Custom JS scripts -->
-        {{#each additional_js}}
-        <script type="text/javascript" src="{{ ../path_to_root }}{{this}}"></script>
-        {{/each}}
-
-        {{#if is_print}}
-        {{#if mathjax_support}}
-        <script type="text/javascript">
-        window.addEventListener('load', function() {
-            MathJax.Hub.Register.StartupHook('End', function() {
-                window.setTimeout(window.print, 100);
-            });
-        });
-        </script>
-        {{else}}
-        <script type="text/javascript">
-        window.addEventListener('load', function() {
-            window.setTimeout(window.print, 100);
-        });
-        </script>
-        {{/if}}
-        {{/if}}
-
-    </body>
-</html>
