✨ add react-remark library, test it in SimpleMarkdownText

[danyx23]

This PR adds the react-remark library. This seems to be the best library for parsing markdown given the following requirements:

• We want parsing to be separate from rendering, with the ability to modify the AST in between
• We'd like extensions to be straightforward and ideally a nice ecosystem of plugins for things like mathematical formulas, tables etc
• We'd like to avoid dangerouslySetInnerHTML in React

This PR then replaces the rendering path of the SimpleMarkdownText component with the new parser.

Bundle size increases by about 40KB minified + gzipped but I think this is an ok trade-off

[danyx23]

Current dependencies on/for this PR:

• master
  • PR ✨ add react-remark library, test it in SimpleMarkdownText #2875 👈
    • PR ✨ Switch all markdown rendering to react-remark #2872
      • PR Markdown: turn plain URLs into links #2884
        • PR Markdown: special handling of DoD links #2873
          • PR 🔨 fix minor rebase issues #2874

This stack of pull requests is managed by Graphite.

[danyx23]

Merge activity

• Nov 7, 3:55 PM: @danyx23 started a stack merge that includes this pull request via Graphite.
• Nov 7, 3:56 PM: Graphite couldn't merge this PR because it had conflicts with the trunk branch.
• Nov 7, 4:03 PM: @danyx23 started a stack merge that includes this pull request via Graphite.
• Nov 7, 4:03 PM: @danyx23 merged this pull request with Graphite.