Docs: fix mkdocstings config and improve api autodoc

[Guts]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.12%. Comparing base (7ba4bd5) to head (b188451).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   81.12%   81.12%           
=======================================
  Files          11       11           
  Lines         747      747           
  Branches      125      125           
=======================================
  Hits          606      606           
  Misses         97       97           
  Partials       44       44           

Flag	Coverage Δ
unittests	81.12% <100.00%> (ø)

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Files with missing lines	Coverage Δ
mkdocs_rss_plugin/constants.py	100.00% <100.00%> (ø)
mkdocs_rss_plugin/git_manager/ci.py	70.37% <100.00%> (ø)
mkdocs_rss_plugin/models.py	100.00% <ø> (ø)
mkdocs_rss_plugin/timezoner.py	83.33% <ø> (ø)