clean up project root #1743

Job	Run time
ubuntu (ubuntu-latest, 3.10, tests/model)	11m 24s
windows (windows-latest, 3.12, tests/model)	17m 55s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	9m 37s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	16m 27s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	3m 29s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	7m 57s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	9m 0s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	15m 53s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	8m 15s
windows (windows-latest, 3.12, tests/distributions)	15m 8s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	15m 15s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	27m 49s
all_tests	1s
	2h 38m 10s

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