Add docs page and update PerTau example #112

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	14s
deploy-examples	0s
tests / Load tox environments	5s
tests / py39-test (ubuntu-latest)	3m 30s
tests / py310-test (ubuntu-latest)	3m 8s
tests / py311-test (ubuntu-latest)	3m 33s
tests / py312-test (ubuntu-latest)	3m 24s
tests / py39-test (macos-12)	7m 54s
tests / py310-test (macos-latest)	7m 5s
tests / py311-test (macos-latest)	4m 54s
tests / py312-test (macos-latest)	4m 40s
tests / py39-test (windows-latest)	6m 3s
tests / py310-test (windows-latest)	5m 51s
tests / py311-test (windows-latest)	6m 28s
tests / py312-test (windows-latest)	5m 52s
	1h 2m 45s

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