Category templating

[rofafor]

I wanted to avoid the hard-coded category title markdown, i.e. change it from ## Features to ### Features to be a bit more subtle.

[jetersen]

Please rebase onto master and run yarn install to get the latest @vercel/ncc than rerun yarn build to avoid the many thousand of changes inside dist/index.js

[rofafor]

Thanks. I had some odd issues for generating the file on my MAC: all kind of CRLF issues no matter which core.autocrlfsetting I was using. Looks better now.

[jetersen]

LGTM!

Thanks for contributing! 👏