Require Python 3.10 and Sphinx 7.3

[AA-Turner]

See also python/cpython#129576. This would mean this theme is no longer installable with the 3.10 or 3.11 branches, which require sphinx==3.4.3 and sphinx~=7.2.0 respectively.

Changes:

• Require Python 3.10 (used on the docs server)
• Require Sphinx 7.3
• Drop _add_asset_hashes patch
• Drop CSS for Sphinx 4.x
• Drop sidebar.js_t for Sphinx 4.x
• Add static type annotations to setup()
• Convert theme.conf to the new theme.toml (via python -m sphinx.theming conf_to_toml python_docs_theme)
• Define the versionextension metadata field.
• Replace @import url(...) with an entry in the sidebars list, to allow parallel stylesheet fetching by the user agent

A

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📚 Documentation preview 📚: https://python-docs-theme-previews--221.org.readthedocs.build/

[hugovk]

(There's a conflict after merging #219.)

Looking good, although before merging and pinning 3.11 to 2024.12 in python/cpython#129576, it might be nice to get #218 merged and released in 2025.2, and then pinning 3.11 to 2025.2?

[hugovk]

Thanks!

[AA-Turner]

3.10 & 3.11 are now pinned to 2025.2, so merging this.

A