Fix search override

[flying-sheep]

rtd-sphinx-search is no longer a thing: readthedocs/readthedocs-sphinx-search#144

See also readthedocs/addons#570

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a9cd061) to head (c1cf678).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #208   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines          512       511    -1     
=========================================
- Hits           512       511    -1     

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