Add project description to PyPI page

[chibby0ne]

Currently spnl PyPI page has no project description. This is due to the pyproject.toml not including the README.md section.
In addition to that README.md specified in pyproject.toml are not included in binary distributions (i.e: wheel builds) so a source distribution needs to be created as well.
In addition made a small refactor of the --features flag of maturin build according to the documentation.

[starpit]

thanks! i see you added sdist. We may need to confirm that the publish_pypi github action is publishing it (separate PR, if needed)?

[chibby0ne]

thanks! i see you added sdist. We may need to confirm that the publish_pypi github action is publishing it (separate PR, if needed)?

Yeah you're right. It seems it doesn't upload the sdist at the moment 🤔

spnl/.github/workflows/publish_pypi.yml

Lines 35 to 39 in 0e2395a

	- name: Upload wheels
	uses: actions/upload-artifact@v4
	with:
	name: build-${{ matrix.os }}-${{matrix.python-version}}-${{ github.sha }}
	path: target/wheels/*.whl

spnl/.github/workflows/publish_pypi.yml

Lines 52 to 61 in 0e2395a

	path: artifacts1/
	- name: List artifacts
	run: |
	find artifacts1
	mkdir artifacts
	find artifacts1 -name '*.whl' -exec mv {} artifacts \; -print
	- name: Publish to PyPI
	uses: pypa/gh-action-pypi-publish@v1.12.4
	with:
	packages-dir: artifacts/

Another PR is in order then