Aligns MANIFEST.in to template #559

Job	Run time
Build sdist	13s
build ubuntu-latest (x86_64) wheels	8m 14s
build macos-latest (x86_64) wheels	2m 20s
build macos-latest (arm64) wheels	1m 16s
build windows-latest (AMD64) wheels	5m 13s
Show artifacts	3s
Publish to Test PyPI	0s
Publish to PyPI	0s
	17m 19s

Provide feedback