theme update and doc fixes #1754

Job	Run time
ubuntu (ubuntu-latest, 3.10, tests/model)	11m 25s
windows (windows-latest, 3.12, tests/model)	39m 5s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	9m 39s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	1h 7m 24s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	3m 27s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	9m 44s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	8m 38s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	6h 0m 19s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	8m 19s
windows (windows-latest, 3.12, tests/distributions)	2h 51m 25s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	15m 9s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	6h 0m 18s
all_tests	1s
	17h 44m 53s

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