Sphinx-audeering-theme

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* Fixed: font files weren't included
in Python package

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* Added: support for Python 3.10
* Added: "Research" link in footer
* Changed: use new audEERING logo
* Changed: mark extension safe
for parallel read and write
* Changed: "Infrastructure" link
in footer now points
to http://devops.pp.audeering.com
* Changed: rename "Infrastructure" link
in footer
to "Infra"
* Changed: rename "Documentation" link
in footer
to "Docs"
* Removed: dependency to ``sphinx_rtd_theme``;
the required source files are now included

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* Fixed: reduced bottom margin of nested bullet points
* Fixed: floating of class properties in API docs
* Fixed: margin of class properties in API docs

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* Fixed: display italic text in docstrings as italic

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* Changed: link to infrastructure page in footer

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* Added: Python 3.9 support
* Removed: Python 3.6 support