Separate dependencies in two subsections

docs/getting_started/installation.rst

@@ -16,10 +16,16 @@ Whether you just want to try out the demo site, or you're ready to dive in and c
 Dependencies
 ============
 
+Barebones
+---------
+
 The basic Wagtail installation is pure Python. No build tools are required on the host machine.
+For the full list of absolutely required libraries, see `setup.py <https://github.com/torchbox/wagtail/blob/master/setup.py>`__.
+
 If you are installing Wagtail differently (e.g. from the Git repository), you must run ``python setup.py install`` from the repository root. The above command will install all Wagtail dependencies.
 
-For the full list of absolutely required libraries, see `setup.py <https://github.com/torchbox/wagtail/blob/master/setup.py>`__.
+Administration UI
+-----------------
 
 .. warning::