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README: fix stale doc references, tidy intro, drop dead section header #53

Job	Run time
Rocky Linux (dnf, RHEL family, containerized)	12m 39s
macOS (Homebrew)	2m 55s
Ubuntu (apt)	11m 17s
Debian (apt, containerized)	10m 51s
Fedora (dnf, containerized)	13m 5s
	50m 47s