increase cross linking in docs

Author: dantownsend

docs/src/piccolo/getting_started/what_is_piccolo.rst

@@ -9,5 +9,6 @@ Some of it's stand out features are:
 * A builtin playground, which makes learning a breeze - see :ref:`Playground`.
 * Works great with `iPython <https://ipython.org/>`_ and
   `VSCode <https://code.visualstudio.com/>`_ - see :ref:`tab_completion`.
-* Batteries included - a User model, authentication, migrations, an admin,
+* Batteries included - a :ref:`User model and authentication <Authentication>`, :ref:`migrations <migrations>`, an :ref:`admin <ecosystem>`,
   and more.
+* Templates for creating your own :ref:`ASGI web app <ASGICommand>`.