build: configure rules for markdownlint

Author: cotes2020

.markdownlint.json

@@ -0,0 +1,8 @@
+{
+  "commands-show-output": false,
+  "blanks-around-fences": false,
+  "line-length": false,
+  "no-inline-html": {
+    "allowed_elements": ["kbd", "sub"]
+  }
+}

.vscode/settings.json

@@ -7,6 +7,9 @@
   "files.associations": {
     "*.html": "liquid"
   },
+  "[markdown]": {
+    "editor.formatOnSave": false
+  },
   // Formatter
   "[html][liquid]": {
     "editor.defaultFormatter": "Shopify.theme-check-vscode"