Add and augment conceptual docs #2278

Job	Run time
build (ubuntu-latest, Debug)	6m 28s
build (macos-latest, Debug)	9m 49s
build (windows-latest, Debug)	13m 23s
build (ubuntu-latest, Release)	6m 58s
build (macos-latest, Release)	6m 45s
build (windows-latest, Release)	11m 21s
publish-coverage / publish-coverage	1m 1s
	55m 45s

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