v2.4.0

What's Changed

• ☑️ feat: mermaid copy code by @pdsuwwz in #52
• ⚡feat: update mermaid plugin by @pdsuwwz in #54
• ⚒️ feat: mermaid toolkit by @pdsuwwz in #55
• 💅 feat: up toolkit styles by @pdsuwwz in #56

Full Changelog: v2.3.0...v2.4.0