Javadoc changes (#31956)
Summary:
- Add Javadoc url in index.rst
- Delete no longer needed java rst files
- Remove intersphinx extension from conf.oy
- Remove javasphinx from docs/requirements.txt
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31956
Differential Revision: D19320493
Pulled By: jlin27
fbshipit-source-id: cc76b2a2acbe2ecdabcd3339e1cc3182f0c906ae
