Add and augment conceptual docs #2286

Job	Run time
build (macos-latest, Debug)	5m 28s
build (ubuntu-latest, Debug)	6m 59s
build (windows-latest, Debug)	13m 31s
build (ubuntu-latest, Release)	6m 49s
build (windows-latest, Release)	16m 13s
build (macos-latest, Release)	11m 14s
publish-coverage	0s
	1h 0m 14s

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