Crate-docs-theme

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- Fix admonition content styles for links and item lists
- Fix version chooser enablement
- Update to Sphinx ``sphinx>=4.6,<7``

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- Add modern components from the Sphinx ecosystem: myst-parser, sphinx-design,
sphinx-inline-tabs, sphinx-subfigure, sphinx-togglebutton, sphinxcontrib-mermaid.
- Refactor GitHub feedback component to separate files
- Migrate version chooser component to sphinx-design dropdown
- Use compact variant of GitHub feedback component at the top of the page
- Remove external links indicator
- Improve visual appearance of admonition components
- Add new ``cloud-docs`` documentation project

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- Removed ``code``-tag from a mobile media query to fix headlines font-sizes

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- Change Crate.io logo to CrateDB
- Remove Crate.io footer logo
- Update Favicons
- Update the ESI fallback links in case we disable it at some point
- Use relative links to pages
- Update opengraph image
- Enable meta description via ``ogp_enable_meta_description = True``

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- Fix wheel package.

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- Fix visual appearance of Intersphinx references per ``xref`` CSS.
Don't render links in bold text when using custom label. Happens,
for example, with ``:class:dictionaries <py:dict>``.