Build, validate & Release

Update README install instructions for PyPI release #26

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Job	Run time
Test install & smoke (Py 3.11)	1m 44s
Test install & smoke (Py 3.10)	1m 48s
Test install & smoke (Py 3.12)	1m 41s
Build release artifacts	-1s
Publish to PyPI (API token)	-1s
	5m 11s