updating index files

docs/howto/index.rst

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+How-To Guides
+=============
+
+How-To guides answer the question 'How do I...?' for a lot of topics.
+
+Content and Data
+----------------
+
+.. toctree::
+   :titlesonly:
+
+   content/nbgitpuller
+   content/add-data
+   content/share-data
+
+The user environment
+--------------------
+
+.. toctree::
+   :titlesonly:
+
+   env/user-environment
+   env/notebook-interfaces
+   env/server-resources
+
+Authentication
+--------------
+
+We have a special set of How-To Guides on using various forms of authentication
+with your JupyterHub. For more information on Authentication, see
+:ref:`topic/authenticator-configuration`
+
+.. toctree::
+   :titlesonly:
+
+   auth/dummy
+   auth/github
+   auth/google
+   auth/firstuse
+   auth/nativeauth
+
+Administration and security
+---------------------------
+
+.. toctree::
+   :titlesonly:
+
+   admin/admin-users
+   admin/resource-estimation
+   admin/resize
+   admin/nbresuse
+   admin/https
+   admin/enable-extensions
+
+Cloud provider configuration
+----------------------------
+
+.. toctree::
+   :titlesonly:
+
+   providers/digitalocean
+   providers/azure