Remove numpydoc validation from Sphinx build #2170

Job	Run time
cache-pixi-lock / Pixi lock	1m 31s
Unit tests: windows \| pixi run -e test tests	6m 46s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 56s
Unit tests: ubuntu \| pixi run -e test-py313 tests	3m 55s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
Unit tests: ubuntu \| pixi run -e test-py311 tests	4m 0s
Unit tests: ubuntu \| pixi run -e test tests	3m 0s
TypeChecking: pixi run typing	0s
merge-test-artifacts	-1s
	23m 7s

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