Build, validate & Release

Update README install instructions for PyPI release #50

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Job	Run time
Test install & smoke (Py 3.12)	1m 54s
Test install & smoke (Py 3.11)	1m 45s
Test install & smoke (Py 3.10)	1m 30s
Publish to PyPI (API token)	0s
Build release artifacts	0s
	5m 9s