Per #1407 review: the options reference should be markdown here; the
HTML + CSS belongs in the website repo where the theme lives and the
stylesheet can be shared with /docs.
- nix/docs/default.nix: drop the cmark-gfm HTML rendering, the inline
<style>, and the HTML index. Emit index.md + host.md + agent.md only
(CommonMark from nixosOptionsDoc).
- Remove nix/docs/style.css.
- Update docs/gotchas.md + CLAUDE.md to describe the md-only output and
point at the website for HTML rendering.
The website (hyperhive/website#26) renders these .md to themed HTML for
/options/, sharing one docs.css with the prose /docs/ tree.
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