Astropy-sphinx-theme

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- No changes yet

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- Infrastructure updates. Minimum Python version is now 3.7. [27]

- Fixed overflowing navbar. [40]

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- Added a theme option ``astropy_project_menubar`` which can be used to control
whether to show extra project links in the top bar. [4, 8]

- Fixed compatibility with Sphinx 2.x. [6]

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- Initial standalone version of the theme (formerly packaged as part of astropy-helpers)