build

wip: implement `jj docs` command #10918

Job	Run time
Check protos	31s
build (ubuntu-latest)	3m 55s
Clippy check	2m 37s
Check that MkDocs can build the docs	22s
build (macos-14)	3m 15s
Check that MkDocs can build the docs with Poetry 1.3.2	32s
build (windows-latest)	8m 40s
Check formatting	15s
build (ubuntu-latest, --all-features)	4m 47s
cargo-deny (advisories)	27s
cargo-deny (bans licenses sources)	29s
	25m 50s

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