Docs cleanup

[dwreeves]

• Primarily I am cleaning up the docs as per our email discussions
• I also did a few changes to the CI while I was at it:
  • Using uv where I can. (It's a lot faster.)
  • Added actionlint to pre-commit.

[dwreeves]

Docs are almost done, or done, depending on the importance of the final feature.

See docs here:

https://dwreeves.github.io/rich-click/

The only thing missing, i.e. the final feature, is buttons on the editor that correspond with styles, and will set everything to it once clicked:

• Default
• Blank
• Example 1
• Example 2