fix(deps): update dependency remark-gfm to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-gfm	2.0.0 -> 3.0.0

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Release Notes

remarkjs/remark-gfm

v3.0.0

Compare Source

• 890005e Add support for GFM footnotes ✨
  (if you were using remark-footnotes before, you should remove it!)
  (how footnotes are turned to HTML is done in remark-rehype, please update that too)

Full Changelog: remarkjs/remark-gfm@2.0.0...3.0.0

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