Add `remark-mermaidjs` to list of plugins

[remcohaszing]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

Add remark-mermaidjs to the list of remark plugins.

[codecov-commenter]

Codecov Report

Merging #907 (50fc9bc) into main (f679aa2) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #907   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          905       905           
=========================================
  Hits           905       905           

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[github-actions[bot]]

Hi! This was closed. Team: If this was merged, please describe when this is likely to be released. Otherwise, please add one of the no/* labels.

[wooorm]

Thanks Remco!