build

README: announce our docs website to the world + instructions to contribute #6781

Job	Run time
Check protos	36s
cargo-deny (advisories)	28s
cargo-deny (bans licenses sources)	35s
build (ubuntu-latest)	10m 13s
build (macos-13)	5m 12s
build (windows-latest)	11m 55s
build (ubuntu-latest, --all-features)	6m 43s
Clippy check	2m 45s
Check formatting	17s
Check that MkDocs can build the docs	24s
	39m 8s

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