DOC: remove `.html` from page URLs (#245) #337

Job	Run time
style / Determine skipped pre-commit hooks	9s
pytest / Determine job matrix	6s
doc / linkcheck / Check external links	57s
doc / nb / Execute and build documentation	1m 17s
pytest / Run unit tests (3.10, ubuntu-22.04)	1m 39s
pytest / Run unit tests (3.11, ubuntu-22.04)	1m 21s
pytest / Run unit tests (3.12, ubuntu-22.04)	1m 41s
pytest / Run unit tests (3.7, ubuntu-22.04)	1m 50s
pytest / Run unit tests (3.8, ubuntu-22.04)	1m 48s
pytest / Run unit tests (3.6, ubuntu-20.04)	1m 46s
pytest / Run unit tests (3.9, ubuntu-22.04, qrules)	4m 16s
pytest / Run unit tests (3.9, macos-12)	2m 7s
style / Run taplo through pre-commit	19s
style / Run local pre-commit hooks	1m 5s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	20m 21s

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