MAINT: clean up Sphinx configuration #266

Job	Run time
style / Determine skipped pre-commit hooks	8s
pytest / Determine job matrix	5s
doc / linkcheck / Check external links	1m 30s
doc / nb / Execute and build documentation	1m 25s
pytest / Run unit tests (3.10, ubuntu-22.04)	1m 2s
pytest / Run unit tests (3.11, ubuntu-22.04)	55s
pytest / Run unit tests (3.12, ubuntu-22.04)	1m 4s
pytest / Run unit tests (3.7, ubuntu-22.04)	1m 13s
pytest / Run unit tests (3.9, ubuntu-22.04)	1m 3s
pytest / Run unit tests (3.8, ubuntu-22.04, ampform)	1m 52s
pytest / Run unit tests (3.9, macos-12)	1m 27s
style / Run taplo through pre-commit	22s
style / Run local pre-commit hooks	56s
style / Push changes	6s
doc / Upload to GitHub Pages	0s
	13m 8s

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