Release process docs (#2214)

* Setup groundwork for release process docs

I'm using MyST for the index page since I like it more and it's easier
to work with.

* Fill in Release Process for black

* Apply suggestions from code review

Apply Jelle's grammar + typo fixes. I am a terrible only English speaker.

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* Update release_process.md

Make lint happy via web UI.

* Move to contribution section and fix prettier

Co-authored-by: Richard Si <63936253+ichard26@users.noreply.github.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>