This PR formats the CSS in the docs with Prettier.
The indentation of these CSS files kept changing based on who last
touched them, so I added settings to the Zed repo to try and keep the
formatting intact until we can enforce it in CI.
Release Notes:
- N/A
- Mostly just tweaking some design (colors & spacing) stuff
- Some small accessibility things—e.g., underline decoration for links
and one h1 only per page
- Most of the other captured changes are really just Prettier indenting
stuff
Release Notes:
- N/A
