Add support of mindmaps and timelines

This is great. It doesn’t seem to work with mindmaps and timelines though. I tried forking it and updating to Mermaid v9.4.0, but I’m still getting an error. This code works in their live editor, but not in Discourse, even with Mermaid v9.4.0:

mindmap
Root
    A
      B
      C

also this one, but it doesn’t work in their live editor either, which appears to be running v9.3.0. It does run in a plain HTML page using v9.4.0.

timeline
    title History of Social Media Platform
    2002 : LinkedIn
    2004 : Facebook : Google
    2005 : Youtube
    2006 : Twitter

If I figure it out I’ll post back here.

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This needs upgrade to able to use new mermaid js features.
I have the same issue:

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@team Any chance we could get Timeline, mindmaps and such working or at-least point in the right direction to get it working?

Update should land shortly:

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Thank you Sam :)!

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