Fix documentation conf for readthedocs deprecations #2499

Job	Run time
coverage	1m 54s
examples	2m 54s
benchmarks	1m 38s
docs	2m 9s
pin	2m 34s
test (ubuntu-latest, 3.12)	1m 39s
pre-commit	55s
test (macos-latest, 3.12)	1m 34s
test (windows-latest, 3.12)	6m 41s
tutorials_list	3s
tutorials (tutorials/arm_repertoire.ipynb)	1m 1s
tutorials (tutorials/cma_mae.ipynb)	8m 30s
tutorials (tutorials/features/example.ipynb)	38s
tutorials (tutorials/fooling_mnist.ipynb)	3m 18s
tutorials (tutorials/lsi_mnist.ipynb)	8m 32s
tutorials (tutorials/lunar_lander.ipynb)	9m 30s
tutorials (tutorials/scalable_cma_mae.ipynb)	4m 20s
deploy	0s
	57m 50s

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