Add support for mermaid diagrams to the forum

Mermaid seems to allow for many different kinds of figures (some info and examples here: About Mermaid | Mermaid), and it would be great to have the ability to quickly create diagrams in posts. The following discourse component appears to support this:

Might this possibly be worth setting up for the rust forum site?

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I kind of hate mermaid, but much less than everything else I've tried, and it's supported pretty much everywhere now. I guess this is agreement? :person_shrugging:

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Who is responsible for the site, and what is the process for trying out something new like this?