sphinx扩展
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* 官网: https://www.sphinx-doc.org/en/master/usage/extensions/index.html
* https://github.com/topics/sphinx-extension  


.. toctree::
   :maxdepth: 2

   extensions/math
   extensions/plantuml
   extensions/graphviz
   extensions/recommonmark
   extensions/rli
   extensions/sphinx-git
   extensions/nbsphinx
   extensions/sphinx-copybutton
   extensions/sphinx-gallery
   extensions/other