Separate dev dependencies from actual dependencies

[flying-sheep]

black should almost certainly not be in project.dependencies.

[keller-mark]

It is a bit unusual but that one is correct. See https://github.com/vitessce/vitessce-python/blob/main/vitessce/config.py#L1687

[keller-mark]

This is used to construct Jupyter notebooks that contain Python code. The use case is to go from JSON dict to the equivalent Python code block that uses the VitessceConfig API that will generate that same Vitessce configuration

[keller-mark]

But would be open to making it optional and imported in the function scope if that is preferred

[flying-sheep]

I see, interesting! Sorry for assuming here.