Restructure docs organization and naming (#31849)
Summary:
* Rename “Other Languages” → “Language Bindings”
* Move the Community section to the bottom
* Move "Language Bindings" above "Python API"
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31849
Differential Revision: D19290966
Pulled By: jlin27
fbshipit-source-id: 30b579e032a9fb1636e4afc7bbbd85a2708f637d
