docs: DocFX v2 upgrade with organized API landing page #23

Job	Run time
test (windows-latest)	4m 36s
test (ubuntu-latest, & TestCategory!=WindowsOnly)	3m 0s
test (macos-latest, & TestCategory!=WindowsOnly)	2m 59s
publish-nuget	0s
create-release	0s
build-nuget	0s
	10m 35s

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