docs: use prettier to format Markdown files

Tomas Vikrequested to merge
prettier-md into main

This MR changes package.json so that md files are automatically formatted by prettier.

Then I run npm run autofix to apply the new formatting to all .md files.

With the exception of:

  • CHANGELOG.md - automatically generated using different rules
  • docs/user/custom-queries.md - the table formatting doesn't work well for the large table

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