theme update and doc fixes #1763

Job	Run time
ubuntu (ubuntu-latest, 3.10, tests/model)	10m 41s
windows (windows-latest, 3.12, tests/model)	17m 39s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	13m 32s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	8m 45s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	5m 18s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	2m 40s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	13m 58s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	7m 57s
windows (windows-latest, 3.12, tests/distributions)	15m 10s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	7m 17s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	27m 15s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	14m 48s
all_tests	1s
	2h 25m 1s

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