* Add mermaid.js, remove mermaid codeblocks from <pre> tags, styles * add custom codeblock renderer, remove jquery unwrapping, hide mermaid blocks until fully rendered * update comment * layout update * Add section to the handbook about mermaid code blocks, add mermaid styles to handbook * Update handbook/community.md * Update handbook/community.md Co-authored-by: Mike Thomas <78363703+mike-j-thomas@users.noreply.github.com>