we stopped building mdbook from source #1680

Job	Run time
minimal	29s
check-cfg	3m 19s
docs	45s
msrv	3m 19s
quickchecking	31s
rustfmt-clippy	54s
test-book	21s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	3m 15s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	3m 32s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	2m 41s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	2m 56s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	3m 23s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	4m 18s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	3m 33s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	5m 10s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 50s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 52s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	3m 28s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	3m 37s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	4m 52s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	4m 41s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	4m 25s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	4m 38s
test (ubuntu-latest, 9.0, 0, 0, 1)	2m 5s
test (macos-latest, 9.0, 0, 0, 0)	2m 12s
test-expectations (ubuntu-latest)	2m 0s
test-expectations (macos-latest)	6m 45s
	1h 22m 51s

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