Disable the check on the number of channels when using cellpose v4 + docs clarifications #513

Job	Run time
pre-commit	12s
macOS-latest \| pytest cellpose v4	9m 13s
ubuntu-latest \| pytest cellpose v4	13m 57s
macOS-latest \| pytest wsi	7m 40s
ubuntu-latest \| pytest wsi	7m 10s
macOS-latest \| pytest with pip install	1m 56s
windows-latest \| pytest cellpose v4	2m 18s
pytest and snakemake (windows-latest, 3.12)	5m 45s
pytest and snakemake (ubuntu-latest, 3.11)	5m 54s
pytest and snakemake (windows-latest, 3.13)	9m 18s
pytest and snakemake (ubuntu-latest, 3.13)	9m 1s
pytest and snakemake (macOS-latest, 3.12)	5m 43s
windows-latest \| pytest wsi	6m 42s
pytest and snakemake (ubuntu-latest, 3.12)	6m 1s
pytest and snakemake (macOS-latest, 3.11)	5m 47s
pytest and snakemake (windows-latest, 3.11)	6m 6s
ubuntu-latest \| pytest with pip install	2m 1s
windows-latest \| pytest with pip install	3m 35s
PyPI release	-1s
Deploy documentation	-1s
	1h 48m 17s

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