clean up project root #1738

Job	Run time
windows (windows-latest, 3.12, tests/model)	18m 29s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	16m 7s
ubuntu (ubuntu-latest, 3.10, tests/model)	1m 10s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	6m 37s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	1m 7s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	15m 22s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	1m 6s
windows (windows-latest, 3.12, tests/distributions)	15m 31s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	26m 51s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	1m 5s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	1m 6s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	1m 10s
all_tests	1s
	1h 45m 42s

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