- Fix sidebar kindBadge: map leaf-page→pg, module-type→MT, etc. (was
showing "L" for leaf-page entries)
- Stop escaping sidebar content HTML (entries contain <code> tags)
- Fix inline sidebar JSON: use Html.cdata_script instead of Html.txt
to prevent HTML-escaping inside <script> tags
- Add --xo-* CSS custom properties for x-ocaml cells in light/dark themes
- Fix support file registration: use 'opam var share' instead of
'opam var x-ocaml:share' (works without x-ocaml being an opam package)
- Suppress empty <li> from config-only extension tags (@x-ocaml.*)
- Add worker_url field to jtw opam findlib_index.json
- Refactor x-ocaml.js worker URL discovery to support both direct
worker_url and day10-style version/content_hash paths

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Accept deletion of odoc-docsite files (removed in our branch).
Update auto-generated README.md and dune-project from sync.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Extend the odoc shell plugin interface with a sidebar_data field that
provides the raw Odoc_document.Sidebar.t alongside the pre-rendered HTML
sidebar. This allows shell plugins to generate custom sidebar UIs from
structured data rather than being limited to the default HTML rendering.

Create the odoc-docsite shell plugin (--shell docsite) that generates a
docs.rs-inspired documentation website with a fixed header, interactive
sidebar with package selector, full-text search, SPA navigation, dark
mode, and responsive layout. The sidebar JSON is embedded inline in each
page for client-side rendering.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>