Add a quickstart tutorial & re-organize index page

We split docs into tutorials & more in-depth guides.

docs/guides/admin.rst

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+Administrative Access
+---------------------
+
+In The Littlest JupyterHub, we try to allow users to do as many administrative
+tasks as possible within JupyterHub itself. Admin users can:
+
+1. Have full root access with passwordless ``sudo``
+2. Install systemwide packages with ``apt``
+3. Install ``conda`` / ``pip`` packages for all JupyterHub
+4. Change amount of RAM / CPU available to each user and more!
+
+By default, there are no admin users. You should add some after installation.
+
+Adding admin users
+==================
+
+Admin users are specified in the `YAML <https://en.wikipedia.org/wiki/YAML>`_
+config file at ``/opt/tljh/config.yaml``.
+
+1. Open the ``config.yaml`` file for editing.
+
+   .. code-block:: bash
+
+      sudo nano /opt/tljh/config.yaml
+
+2. Add usernames that should have admin access.
+
+   .. code-block:: yaml
+
+      users:
+        admin:
+          - user1
+          - user2
+
+   Be careful around the syntax - indentation matters, and you should be using
+   spaces and not tabs.
+
+   When you are done, save the file and exit. In ``nano``, you can do this with
+   ``Ctrl+X`` key.
+
+3. When you are sure the format is ok, restart JupyterHub to let the config take
+   effect.
+
+   .. code-block:: bash
+
+      sudo systemctl restart jupyterhub
+
+This should give you admin access from JupyterHub! You can verify this by:
+
+1. Opening a Terminal in your JupyterHub and checking if ``sudo`` works
+2. Opening your JupyterHub ``Control Panel`` and checking for the **Admin** tab
+
+From now on, you can use the JupyterHub to do most configuration changes.

docs/guides/install.rst

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+.. _installation:
+
+Installation
+============
+
+Quick Installation
+------------------
+
+The quick way to install The Littlest JupyterHub (tljh) is:
+
+.. code-block:: bash
+
+   curl https://raw.githubusercontent.com/yuvipanda/the-littlest-jupyterhub/master/installer/install.bash | sudo bash -
+
+This takes 2-5 minutes to run. When completed, you can access your new JupyterHub
+at the public IP of your server!
+
+You should probably add yourself as an `admin user <admin.md>`_
+after installation.
+
+Slightly less quick installation
+--------------------------------
+
+If you can read ``bash`` and are nervous about the previous installation method,
+you can inspect the installer script before running it.
+
+
+1. Download the installer script
+
+   .. code-block:: bash
+
+      curl https://raw.githubusercontent.com/yuvipanda/the-littlest-jupyterhub/master/installer/install.bash  -o install.bash
+
+2. Read the install script source using your favorite text editor
+
+3. Run the installer script
+
+   .. code-block:: bash
+
+      sudo install.bash
+
+   This should have the exact same effects as the quick installer method.

docs/guides/requirements.rst

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+.. _requirements:
+
+Server Requirements
+===================
+
+The Littlest JupyterHub (TLJH) can run on servers that meet at least he following criteria:
+
+
+#. Ubuntu Linux Operating System (minimum version supported 18.04)
+#. Full root access
+#. Access to the internet
+#. At least 512MB of RAM
+
+While TLJH will run on machines that meet these requirements, you should also
+consider how much resources your individual users need before acquiring a server.