clean up project root #1740

Job	Run time
windows (windows-latest, 3.12, tests/model)	18m 1s
ubuntu (ubuntu-latest, 3.10, tests/model)	11m 39s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	15m 3s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	9m 13s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	5m 59s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	3m 21s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	8m 41s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	15m 35s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	7m 57s
windows (windows-latest, 3.12, tests/distributions)	15m 6s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	14m 49s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	26m 58s
all_tests	1s
	2h 32m 23s

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