added note on using the heroku training sandbox to the ttw theming document

pigeonflight · pigeonflight · commit 314b3670ba3e · 2016-10-10T16:01:18.000-05:00
diff --git a/theming/ttw-advanced.rst b/theming/ttw-advanced.rst
@@ -18,6 +18,12 @@ Topics covered:
 * ``<body>`` element CSS classes
 * Conditionally activating rules
 
+Installation
+------------
+
+We will use a `Plone pre-configured Heroku instance <https://github.com/collective/training-sandbox>`_.
+
+Once deployed, create a Plone site.
 
 Two approaches to theming
 -------------------------
