build

Add Sphinx documentation #471

Job	Run time
Build Python source .tar.gz	13s
Build sphinx documentation	27s
Build sphinx documentation on Windows	57s
ubuntu-latest Py 3.8 x64	19s
ubuntu-latest Py 3.9 x64	38s
ubuntu-latest Py 3.10 x64	44s
ubuntu-latest Py 3.11 x64	38s
ubuntu-latest Py 3.12 x64	48s
ubuntu-latest Py pypy3.9 x64	31s
windows-latest Py 3.8 x86	1m 13s
windows-latest Py 3.8 x64	1m 6s
windows-latest Py 3.9 x86	2m 18s
windows-latest Py 3.9 x64	2m 7s
windows-latest Py 3.10 x86	2m 19s
windows-latest Py 3.10 x64	2m 9s
windows-latest Py 3.11 x86	2m 37s
windows-latest Py 3.11 x64	2m 7s
windows-latest Py 3.12 x86	2m 44s
windows-latest Py 3.12 x64	2m 14s
windows-latest Py pypy3.9 x86	1m 32s
windows-latest Py pypy3.9 x64	1m 36s
macos-latest Py 3.11 x64	53s
macos-latest Py 3.12 x64	1m 0s
macos-latest Py pypy3.9 x64	1m 2s
	32m 12s

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