DOCS: Delete v4 api page #2269

Job	Run time
should run ci	7s
cache-pixi-lock	2m 47s
Unit tests: ubuntu \| pixi run -e test-py313 tests	4m 4s
Unit tests: ubuntu \| pixi run -e test-py311 tests	4m 11s
Unit tests: windows \| pixi run -e test tests	7m 0s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 55s
Unit tests: ubuntu \| pixi run -e test tests	3m 8s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	25m 12s

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