adding docs on enabling notebook extensions

docs/howto/admin/enable-extensions.rst

@@ -0,0 +1,60 @@
+.. _howto/admin/extensions:
+
+====================================
+Enabling Jupyter Notebook extensions
+====================================
+
+Jupyter contributed notebook 
+`extensions <https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/index.html>`_ are
+community-contributed and maintained plug-ins to the Jupyter notebook. These extensions
+serve many purposes, from `pedagogical tools <https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/codefolding/readme.html>`_
+to tools for `converting <https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/latex_envs/README.html>`_
+and `editing <https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/spellchecker/README.html>`_
+notebooks.
+
+Extensions are often added and enabled through the graphical user interface of the notebook.
+However, this interface only makes the extension available to the user, not all users on a 
+hub. Instead, to make contributed extensions available to your users, you will use the command 
+line. This can be completed using the terminal in the JupyterHub (or via SSH-ing into your 
+VM and using this terminal).
+
+.. _tljh_extension_cli:
+
+Enabling extensions via the command line 
+========================================
+
+#. There are `multiple ways <https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/install.html>`_
+   to install contributed extensions. For this example, we will use ``pip``.
+
+   .. code-block:: bash
+
+      sudo -E pip install jupyter_contrib_nbextensions
+
+#. Next, add the notebook extension style files to the Jupyter configuration files.
+
+   .. code-block:: bash
+
+      sudo -E jupyter contrib nbextension install --system
+
+#. Then, you will enable the extensions you would like to use. The syntax for this is 
+   ``jupyter nbextension enable`` followed by the path to the desired extension's main file. 
+   For example, to enable `scratchpad <https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/scratchpad/README.html>`_,
+   you would type the following: 
+
+   .. code-block:: bash
+
+      sudo -E jupyter nbextension enable scratchpad/main --system
+
+#. When this is completed, the enabled extension should be visible in the extension list:
+
+   .. code-block:: bash
+
+      jupyter nbextension list
+
+#. You can also verify the availability of the extension via its user interface in the notebook.
+   For example, spellchecker adds an ABC checkmark icon to the interface.
+
+   .. image:: ../../images/admin/enable-spellcheck.png
+      :alt: spellcheck-interface-changes
+
+