DOC: update link to `pycompwa` website #780

Job	Run time
style / Determine skipped pre-commit hooks	7s
pytest / Determine job matrix	5s
doc / nb / Execute and build documentation	2m 8s
doc / linkcheck / Check external links	2m 18s
pytest / Run unit tests (3.10, ubuntu-22.04)	2m 35s
pytest / Run unit tests (3.11, ubuntu-22.04)	2m 37s
pytest / Run unit tests (3.9, ubuntu-22.04)	2m 36s
pytest / Run unit tests (3.8, ubuntu-22.04, tensorwaves)	3m 17s
pytest / Run unit tests (3.9, macos-12)	5m 34s
style / Run local pre-commit hooks	2m 8s
style / Run taplo through pre-commit	22s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	23m 47s

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