Mermaid.js diagrams

Use mermaid-js to create SVG diagrams from text.

Enable the feature by setting mermaid_diagrams to true in _config.yml, then write code like this:

<mermaid>
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
    D-->E
</mermaid>

See the docs for more.