Simplify and update package README.md files for stable release #2340

Job	Run time
build (macos-latest, Release)	8m 24s
build (ubuntu-latest, Release)	6m 57s
build (ubuntu-latest, Debug)	7m 18s
build (windows-latest, Debug)	10m 55s
build (windows-latest, Release)	11m 14s
build (macos-latest, Debug)	7m 15s
publish-coverage / publish-coverage	1m 48s
	53m 51s

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