[issue33673] Install python-docs-theme even if Sphinx is already installed

[Steve Dower]

Change by Steve Dower <steve.dower at python.org>:


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components: +Windows -Demos and Tools
nosy: +paul.moore, steve.dower, tim.golden, zach.ware

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33673>
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