build

wip: implement `jj docs` command #9579

Job	Run time
cargo-deny (advisories)	21s
Clippy check	2m 26s
build (ubuntu-latest)	3m 18s
cargo-deny (bans licenses sources)	26s
Check protos	24s
build (macos-14)	2m 37s
build (windows-latest)	6m 34s
Check that MkDocs can build the docs	30s
Check that MkDocs can build the docs with Poetry 1.3.2	32s
Check formatting	11s
build (ubuntu-latest, --all-features)	4m 15s
	21m 34s

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