build

README: announce our docs website to the world + instructions to contribute #6838

Job	Run time
cargo-deny (advisories)	37s
cargo-deny (bans licenses sources)	30s
build (ubuntu-latest)	10m 17s
build (macos-13)	3m 41s
build (windows-latest)	11m 25s
build (ubuntu-latest, --all-features)	6m 19s
Check protos	45s
Clippy check	2m 50s
Check that MkDocs can build the docs	38s
Check formatting	23s
	37m 25s

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