Removes the inline security advisory table and the standalone advisory
file (`0001_user_apikeys_invalidation.md`). The advisories section now
directs readers to [GitHub Security
Advisories](https://github.com/coder/coder/security/advisories).
> Generated by Coder Agents on behalf of @jdomeracki-coder
As part of an information architecture overhaul, this PR reorganizes the
About section and adds a Support section (but not content to it yet)
[preview](https://coder.com/docs/@docs-ia-about/about)
this PR is intentionally limited in scope so that we can ship meaningful
changes faster and followup PRs should include:
- [ ] edit + overhaul the About page
- [ ] decide on the `start` directory
- [ ] ~screenshots page updates~ (this should happen July or later)
redirects PR: https://github.com/coder/coder.com/pull/944
---------
Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Jakub Domeracki