docs: organize root documentation #278

Job	Run time
release	22s
build (macos-latest, x86_64-apple-darwin)	3m 57s
build (windows-latest, x86_64-pc-windows-msvc)	6m 13s
build (macos-latest, aarch64-apple-darwin)	6m 24s
build (ubuntu-24.04, x86_64-unknown-linux-gnu)	5m 22s
	22m 18s

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