Since moving from the Wiki we have used the `sphinx_rtd_theme` which has worked well but has become a little dated and has had slow development. This changes to use "Furo" instead.
[Furo](https://github.com/pradyunsg/furo) is a lightweight theme that is responsive and has native dark mode support.
Dark mode is one of the major enhancements but this change also brings:
- Content is slightly larger making text and images easier to view
- Site navigation and page navigation is split into two navigation trees. The site navigation is on the left and page on the right if the page has multiple headings.
- Return to top button
- Content is centered on the screen which helps with wide monitors
- No more breadcrumbs
- Remove google analytics
So far the caveat that I have noticed with this is slower compile times and larger pages, this is due to the better sidebar navigation.
This change also brings a lot of simplifications to customizations that we made to the `sphinx_rtd_theme`. There is still likely room for improvement in the future.
Pull Request: #119684
Updates sphinx and the them to the latest versions
This commit also removes 'babel' from the list of requirements, babel is only important for internationalization.
Updates sphinx and the theme to the latest version along with any of their dependencies.
Note that we will be sticking to sphinx 4.1.1 until sphinx 4.2 for the same reasons listed in:
https://developer.blender.org/rBM8334
Sphinx has rather loose dependency requirements which can cause issues if we aren't careful.
As a solution they recommend that you pin sphinx dependency versions
