Stop using `setup.py` to build the sip module

[philthompson10]

Migrate the building of the sip module from setup.py and setup.cfg to pyproject.toml. Also convert the README to README.md.

[echoix]

Looks like this is done and can be closed

[philthompson10]

On 12/01/2025 21:24, Edouard Choinière wrote: Looks like this is done and can be closed

Are you confusing the `sip` module and SIP itself? `setup.py` can't be removed until `setuptools` adds the required support. Experimental support was added to v74.1.0 (see https://setuptools.pypa.io/en/latest/history.html#v74-1-0).

[echoix]

I think I see what you mean. You're talking about when using sip that you need to use a setup.py?

The readme is already in markdown as I see in here.