Repository navigation

docs: three trees, three audiences, and the rule for citing between them #434

Job	Run time
invariants (linux-x86_64)	4m 2s
invariants (linux-aarch64)	3m 31s
invariants (macos-arm64)	3m 46s
invariants (windows-x86_64)	7m 5s
scan (linux-aarch64)	2m 53s
scan (linux-x86_64)	6m 40s
scan (macos-arm64)	4m 22s
scan (windows-x86_64)	9m 54s
coverage (every host the table names was scanned)	8s
	42m 21s