Reorganize Developer documentation

doc/index.txt

@@ -91,6 +91,9 @@ Check out how Theano can be used for Machine Learning: `Deep Learning Tutorials
 
 Theano was featured at `SciPy 2010 <http://www.iro.umontreal.ca/~lisa/publications2/index.php/publications/show/461>`__.
 
+
+.. _theano_community:
+
 Community
 =========
 

doc/install.txt

@@ -240,6 +240,8 @@ to your ``Theano`` folder and execute the following command:
 You should update frequently, bugs are fixed on a very regular basis.
 
 
+.. _testing_installation:
+
 Testing your installation
 ~~~~~~~~~~~~~~~~~~~~~~~~~