Replace all usages of MUI's `visuallyHidden` utility from `@mui/utils`
with Tailwind's `sr-only` class. Both produce identical CSS, so this is
a no-op behaviorally -- just removes another MUI dependency from the
codebase. Also updates the accessibility example in the frontend
contributing docs to match.
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
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Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
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