Add an automated job to create a list of plugins in the docs.

[tobiasraabe]

Changes

• Add an automated job for creating a list of pytask plugins.
• Schedule job for Monday 1800.

[codecov]

Codecov Report

Merging #222 (e95a718) into main (2ba75a4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #222   +/-   ##
=======================================
  Coverage   93.97%   93.97%           
=======================================
  Files          75       75           
  Lines        6693     6693           
=======================================
  Hits         6290     6290           
  Misses        403      403           

Flag	Coverage Δ
end_to_end	79.60% <ø> (ø)
integration	41.76% <ø> (ø)
unit	70.26% <ø> (ø)

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