build

README: announce our docs website to the world + instructions to contribute #6786

Job	Run time
cargo-deny (advisories)	33s
cargo-deny (bans licenses sources)	31s
build (ubuntu-latest)	10m 11s
build (macos-13)	4m 50s
build (windows-latest)	11m 4s
build (ubuntu-latest, --all-features)	6m 52s
Check protos	36s
Clippy check	2m 41s
Check that MkDocs can build the docs	23s
Check formatting	18s
	37m 59s

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