Sphinx-audeering-theme

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* Changed: use new logo, favicon and colors from audEERING homepage
* Changed: link only to root of repo in Github/Gitlab links in the page header
* Changed: ``pygments`` style to ``friendly``
* Changed: remove border around code blocks
* Changed: inline code has no longer a background color or border
* Changed: let example section in API docs appear like other sections
* Changed: remove bullet points in API listings
* Changed: use only red or grey for admonitions
* Fixed: bottom margin for table headers

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* Fixed: reduce bottom margin for tables in docstring

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* Fixed: pin ``docutils<0.17`` to avoid formatting errors

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* Fixed: Javascript error in search for ``sphinx>=3.4.0``

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* Fixed: pin ``sphinx-rtd-theme`` to version 0.4.3
to avoid CSS and font incompatibilities

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* Added: link to internal models page in footer