0.3.0: not ready for sphinx 4.1.x

[Tomasz Kłoczko]

I'm trying to package your module as an rpm package.
Obn building documentation looks like sphinx 4.1.2 is failing with:

[tkloczko@barrel cachy-0.3.0]$ sphinx-build -b man -d cachy docs .
Running Sphinx v4.1.2

Exception occurred:
  File "/home/tkloczko/rpmbuild/BUILD/cachy-0.3.0/docs/conf.py", line 270, in setup
    app.add_stylesheet('theme_overrides.css')
AttributeError: 'Sphinx' object has no attribute 'add_stylesheet'
The full traceback has been saved in /tmp/sphinx-err-ipyft3j3.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!

Looks like a lot of other modules had the same issues on mogration to sphinx 4
sphinx-doc/sphinx#7747

[Tomasz Kłoczko]

Gentle ping .. 🤔