Simplify and update package README.md files for stable release (#1388) #2341

Job	Run time
build (macos-latest, Release)	7m 30s
build (macos-latest, Debug)	6m 42s
build (windows-latest, Debug)	11m 36s
build (ubuntu-latest, Release)	7m 49s
build (windows-latest, Release)	12m 11s
build (ubuntu-latest, Debug)	7m 3s
publish-coverage / publish-coverage	1m 3s
	53m 54s

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