Remove sphinx-click.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #22 (b2d16eb) into main (7d08b45) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage   79.56%   79.56%           
=======================================
  Files           4        4           
  Lines          93       93           
=======================================
  Hits           74       74           
  Misses         19       19           

Flag	Coverage Δ
end_to_end	79.56% <ø> (ø)

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