GH-546: Migrate Sphinx documentation #110

Job	Run time
Source	8s
JNI ${{ matrix.platform.runs_on }} ${{ matrix.platform.arch }}	0s
JNI ${{ matrix.platform.runs_on }} ${{ matrix.platform.arch }}	0s
Docs	0s
JNI ${{ matrix.platform.runs_on }} ${{ matrix.platform.arch }}	0s
Binaries	0s
Verify	0s
Upload	0s
	8s

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