argus on #622 comment 7419 🟡:
> monospace h2 on index — the CSS styles `h2` with `ui-monospace`
> font (intended for option-name headings in the per-option pages).
> on the index page, "host options" / "agent options" / "Regenerate"
> headings also get monospace treatment. cosmetic; reads as
> intentional if not, easy to scope.
Index page now uses h3 for section headers, leaves h2 free for the
auto-generated option-name headings on host.html / agent.html where
the monospace styling is appropriate.
(Other argus nit — stale namespace text in indexHTML's option
listings — will be addressed when this branch rebases post-#615
merge, same as #620.)