Add pointers to the new integrating-with-Django docs

docs/getting_started/index.rst

@@ -35,6 +35,7 @@ Inside your ``mysite`` folder, we now just run the setup steps necessary for any
 
 Your site is now accessible at ``http://localhost:8000``, with the admin backend available at ``http://localhost:8000/admin/``.
 
+This will set you up with a new standalone Wagtail project. If you'd like to add Wagtail to an existing Django project instead, see :doc:`integrating_into_django`.
 
 There are a few optional packages which are not installed by default but are recommended to improve performance or add features to Wagtail, including:
 

docs/getting_started/tutorial.rst

@@ -1,6 +1,9 @@
 Your first Wagtail site
 =======================
 
+.. note::
+   This tutorial covers setting up a brand new Wagtail project. If you'd like to add Wagtail to an existing Django project instead, see :doc:`integrating_into_django`.
+
 1. Install Wagtail and its dependencies::
 
     pip install wagtail