docs: refer to compwa-org for contributing

[redeboer]

See ComPWA/PWA-pages#111

[codecov]

Codecov Report

Merging #309 (9307e9d) into main (983e1b7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   80.58%   80.58%           
=======================================
  Files          12       12           
  Lines         814      814           
=======================================
  Hits          656      656           
  Misses        158      158           

Flag	Coverage Δ
unittests	80.58% <ø> (ø)

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[redeboer]

909df9b is ok as long as black is used as a local pre-commit hook

tensorwaves/.pre-commit-config.yaml

Lines 94 to 99 in 0ee4c54

	- id: black
	name: black
	entry: black
	language: system
	types:
	- python

Once we switch to pre-commit.ci though (e.g. ComPWA/qrules#87) with a repo hook for black, black versions will start to mismatch after pre-commit autoupdate.