build

README: announce our docs website to the world + instructions to contribute #6839

Job	Run time
cargo-deny (advisories)	28s
cargo-deny (bans licenses sources)	29s
build (ubuntu-latest)	7m 10s
build (macos-13)	3m 53s
build (windows-latest)	10m 43s
build (ubuntu-latest, --all-features)	7m 17s
Check protos	47s
Clippy check	3m 26s
Check that MkDocs can build the docs	24s
Check formatting	17s
	34m 54s

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