Update docs build

[scasagrande]

• updates readthedocs runner to 24.04 and py313
• fixes for sphinx 8
• applies the readthedocs theme
• fixes all but 1 warning which fixes a bunch of rendering errors
• fixes some typos

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.19%. Comparing base (40bd115) to head (eec79d5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #456   +/-   ##
=======================================
  Coverage   99.19%   99.19%           
=======================================
  Files          94       94           
  Lines        9561     9561           
=======================================
  Hits         9484     9484           
  Misses         77       77           

Flag	Coverage Δ
unittests	99.19% <ø> (ø)

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[trappitsch]

docs look really sweet with the new theme :)