Fix RTD

[teutoburg]

Works: https://scopesim-templates.readthedocs.io/en/fh-fixrtd/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.48%. Comparing base (60df4f9) to head (7699b57).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   73.48%   73.48%           
=======================================
  Files          30       30           
  Lines        1482     1482           
=======================================
  Hits         1089     1089           
  Misses        393      393           

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[teutoburg]

Also activated the PR docs build now, but that will only show up on the next one I think.