ci: merge setup.cfg into pyproject.toml

[wang-boyu]

We had two separated files, setup.cfg and pyproject.toml because some fields were marked as experimental back when they were created: #54 (comment). Now that Mesa uses only pyproject.toml, it would be nice to follow its convention, and making it easier to maintain too.

For example in pyproject.toml we have

mesa-geo/pyproject.toml

Line 5 in 574e3a6

"mesa~=2.2",

whereas in setup.cfg it is

mesa-geo/setup.cfg

Line 33 in 574e3a6

mesa~=2.1.0

something that I forgot to update in #186.

[EwoutH]

I think we should also remove the setup.py in that case. I think that's still leading?

[EwoutH]

I think this is a good start: pyproject-toml Only thing I don't know how to handle is the scripts in setup.py. Are those still essential?

Feel free to continue working on that branch.

[wang-boyu]

Yes we still need to install js/css dependencies in setup.py. This part for Mesa has been moved into the separate repo https://github.com/projectmesa/mesa-viz-tornado. Mesa-Geo probably doesn't need to do this.

[wang-boyu]

Implemented in #208. Closing.