build

wip: implement `jj docs` command #10676

Job	Run time
build (ubuntu-latest)	4m 19s
cargo-deny (advisories)	28s
build (macos-14)	3m 41s
cargo-deny (bans licenses sources)	24s
Check protos	35s
build (windows-latest)	7m 56s
build (ubuntu-latest, --all-features)	5m 17s
Clippy check	2m 33s
Check that MkDocs can build the docs	25s
Check that MkDocs can build the docs with Poetry 1.3.2	34s
Check formatting	15s
	26m 27s

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