Furo

- Add a separate file for CSS that affects other Sphinx extensions.
- Add content to all the existing pages in documentation.
- Clarify that Furo is biased toward smaller documentation sets.
- Clarify that logo files need to be in `html_static_path`
- Improve various explanations in documentation.
- Tweak borders inside tables.
- Tweak bottom spacing on right sidebar.
- Tweak CSS and JS blocks in `base.html` template.
- Tweak how captions for toctrees look.
- Tweak spacing on sidebar ad on Read the Docs.

- Add a recommendations page, for plugins
- Add support for different logos in light and dark mode
- Change location of TOC drawer icon on mobile
- Drop support for `html_sidebars` based customisation.
- Improve how the RTD ads work
- Improve TOC sidebar auto-scroll functional
- Significantly improve footer capabilities

- Add classifiers to the theme.
- Add friendly messages for users of `html_sidebars`.
- Add link to homepage, in mobile header.
- Add support for ethical ads in the sidebar.
- Change `css_variables` to `light_css_variables`.
- Change font stack to match to GitHub.
- Change the color used for `<hr>` tags.
- Change unsplash URLs to use cute+animal as cues
- Document `navigation_with_keys`.
- Drop logic that jumps toc-scroll to bottom-of-page.
- Improve customisation documentation.
- Remove text underline from headerlink.
- Strip tags in title.

- Add a direct dependency on Sphinx.
- Add styling for "highlighted text" in dark mode.
- Add support for sphinx-inline-tabs.
- Change the default development branch name to `main`.
- Drop customisations for sphinx-panel's tabs.
- Rework the entire handling of background and foreground colours.
- Tweak API documentation, when presented in dark mode.
- Tweak Bootstrap 4 `.container` styling (comes from sphinx-panel).
- Tweak borders on tables.
- Tweak dark mode colors.
- Tweak light mode colors.

- Fix image link in README, to show up correctly on PyPI.

- Tweak colors for dark mode.
- Tweak presentation of `<kbd>`, to look better in dark mode.