site: Preserve HTML lists and nested tables in docs2mdx table cells (https://github.com/bazelbuild/bazel/pull/30705)

## Summary
- When `docs2mdx.py` converts HTML reference docs to MDX, table cells containing lists, nested tables, or `<pre>` blocks are now preserved as inline HTML instead of being flattened to broken markdown.
- Adds `docs2mdx_test` with coverage for list-in-cell, nested-table-in-cell, and pre-in-cell cases.

Fixes #30614, #30616, and contributes to #30615.

**Note:** Reference docs under `docs/reference/` need to be regenerated after this lands.

## Approach
`markdownify` converts `<ul>/<ol>` inside `<td>` to inline `* item` text, and nested `<table>` elements into broken pipe syntax. The fix overrides `convert_td`/`convert_th` to emit raw inner HTML for complex cells.

## Test plan

### Unit tests
- [x] `bazel test //scripts/docs:docs2mdx_test //scripts/docs:rewriter_test`

### Mintlify preview
Preview: https://bazel-pr-30705.mintlify.app/

| Check | URL | Expected |
|-------|-----|----------|
| [ ] List in cell | `/reference/be/common-definitions#common-attributes` → `aspect_hints` row | Bullet list renders (not inline `* text`) |
| [ ] List in cell | same page → `tags` row | Multi-level bullet list renders |
| [ ] Nested table | `/reference/be/common-definitions#common-attributes-tests` → `size` row | Inner Size/RAM/CPU table renders |
| [ ] Nested table | same page → `timeout` row | Inner timeout table renders |
| [ ] Code in cell | `/rules/lib/repo/http` | Attribute table not squished (#30615) |

- [x] Preview deployed (bazel-docs bot comment)
- [ ] Visual checks above verified in preview

### Post-merge
- [ ] Regenerate reference docs and confirm on bazel.build

Closes #30705.

PiperOrigin-RevId: 972668092
Change-Id: I8e27931e4a4abc7466463b81aa26e7449eeb0690
2 files changed
tree: 859ab8c532fbd6fa61bbbdbf5302b87709ef1942
  1. .bazelci/
  2. .devcontainer/
  3. .gemini/
  4. .github/
  5. docs/
  6. examples/
  7. scripts/
  8. site/
  9. src/
  10. third_party/
  11. tools/
  12. .bazelrc
  13. .bazelversion
  14. .gitattributes
  15. .gitignore
  16. AGENTS.md
  17. AUTHORS
  18. bazel_downloader.cfg
  19. BUILD
  20. CHANGELOG.md
  21. CODE_OF_CONDUCT.md
  22. CODEOWNERS
  23. combine_distfiles.py
  24. combine_distfiles_to_tar.sh
  25. compile.sh
  26. CONTRIBUTING.md
  27. CONTRIBUTORS
  28. distdir.bzl
  29. extensions.bzl
  30. LICENSE
  31. maven_install.json
  32. MODULE.bazel
  33. MODULE.bazel.lock
  34. oneversion_allowlist.csv
  35. oneversion_allowlist_for_tests.csv
  36. pyproject.toml
  37. README.md
  38. repositories.bzl
  39. requirements.txt
  40. SECURITY.md
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