Add rehype-headings-normalize to list of related projects

[axe312ger]

Initial checklist

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

Description of changes

I wrote a plugin inspired by this neat little helper here. My variant does a few more things, eliminating hierarchical issues potentially added by human editors.

Would be lovely if we could link it here.

Otherwise, feel free to close it!

Cheers

[codecov-commenter]

Welcome to Codecov 🎉

Once merged to your default branch, Codecov will compare your coverage reports and display the results in this comment.

Thanks for integrating Codecov - We've got you covered ☂️

[wooorm]

Fine to also have it here, but plugins can particularly go into https://github.com/rehypejs/rehype/blob/main/doc/plugins.md!