Improve documentation #290

Job	Run time
build (macos-latest, cmake, debug, gnu, 14)	47s
build (ubuntu-latest, meson, debug, gnu, 10)	53s
build (ubuntu-latest, meson, debug, intel, 2021)	4m 27s
build (ubuntu-latest, fpm, debug, gnu, 12)	1m 3s
build (ubuntu-latest, meson, coverage, gnu, 11)	1m 10s
build (ubuntu-latest, cmake, debug, gnu, 14)	38s
build (ubuntu-latest, meson, debug, gnu, 14)	47s
build (macos-latest, meson, debug, gnu, 14)	56s
	10m 41s

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