Sphinx-py3doc-enhanced-theme

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* Fixed issues with highlighting a section (via anchor location hash). Previously code blocks would get ugly bar on the left.

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* Fixed positioning of navigation sidebar when displayed in narrow mode (at the bottom). Previously it overlapped the
footer.

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* Added the ``appendcss`` theme options for quick customization.
* Added the ``path`` setuptools entrypoint so ``html_theme_path`` doesn't need to be set anymore in ``conf.py``.

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* Remove background from reference links when ``extrastyling`` is off.

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* Added new theme option ``extrastyling`` which can be used to get the
original Python 3 docs styling (green code blocks, gray inline code
blocks, no text shadows etc)
* The ``py.png`` favicon is renamed to ``favicon.png``.
* Added some examples for customizing the styling or using a custom favicon.

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* Make inline code blocks bold.