Crate-docs-theme

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- SQL-99: Fix hover and active states of search button and search input field

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- Style: Don't uppercase text, it doesn't look good with the new font

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- Fix typo within "SQL-99 Complete, Really"
- Add an option to adjust the ``html_context`` of individual projects,
for disabling the GitHub feedback box on the SQL-99 project.

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- Add ``html_context`` variable to main configuration blueprint
- Fixed mobile view on ``search.html``
- Provide different design for "SQL-99 Complete, Really" in order to more clearly
separate it from the other documentation projects
- Use Sphinx-native search for "SQL-99 Complete, Really"
- Change primary font to ``Inter`` and secondary to ``Poppins``, remove ``Blender``
- Prevent console errors when no navbar is available
- Disable GitHub feedback box on the SQL-99 project
- Fix regression: Bring back ``pygments.css`` in ``base.html``
- Visually hide injected footer (RTD-native version chooser) after enabling RTD API access

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- Adjust ``proxied_api_host`` once more to fix RTD API access in reverse proxy
scenarios

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- Mitigate double include of ``pygments.css``
- Adjust ``proxied_api_host`` to make RTD footer and version data injection work
in reverse proxy scenarios
- Adjust dependencies to use Sphinx<4 and Jinja2<3.1