Remove leftover user/index.rst

user/index.rst

-.. _swh-docs:
-
-Software Heritage User documentation
-====================================
-
-Getting started
----------------
-* :ref:`faq`
-* :ref:`listers`
-* :ref:`loaders`
-* :ref:`swh_scn_webhooks`
-* :ref:`using-swh-data`
-
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`
-
-
-.. toctree::
-  :maxdepth: 2
-  :caption: Contents:
-  :titlesonly:
-  :hidden:
-
-  faq/index
-  listers/index
-  loaders/index
-  save_code_now/webhooks/index