Doc: use book theme for docs and general maint #3253

Job	Run time
use-custom-cfg	2s
lint / lint	15s
e2e-tests-fast	0s
unit-tests-fast	0s
test-examples / test_examples	26m 38s
check-importable (3.10) / check-importable	32s
check-importable (3.11) / check-importable	34s
check-importable (3.7) / check-importable	33s
check-importable (3.12) / check-importable	37s
check-importable (3.8) / check-importable	28s
check-importable (3.9) / check-importable	27s
e2e-tests-full (3.11) / e2e	1h 33m 8s
e2e-tests-full (3.10) / e2e	2h 33m 53s
e2e-tests-full (3.12) / e2e	1h 46m 50s
e2e-tests-full (3.7) / e2e	2h 10m 57s
e2e-tests-full (3.8) / e2e	2h 14m 6s
e2e-tests-full (3.9) / e2e	1h 52m 19s
unit-tests-full (3.10) / unit-tests	6m 9s
unit-tests-full (3.11) / unit-tests	4m 9s
unit-tests-full (3.12) / unit-tests	4m 11s
unit-tests-full (3.7) / unit-tests	6m 31s
unit-tests-full (3.8) / unit-tests	4m 11s
unit-tests-full (3.9) / unit-tests	4m 36s
	13h 11m 6s

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