took down link to non-existent autogenerated api doc

doc/index.txt

@@ -39,7 +39,6 @@ Roughly in order of what you'll want to check out:
 * :ref:`optimizations` -- Guide to Theano's graph optimizations.
 * :ref:`extending` -- Learn to add a Type, Op, or graph optimization.
 * :ref:`internal` -- How to maintaining Theano, LISA-specific tips, and more...
-* `API <api/>`_ -- The automatically-generated API
 
 You can download the latest `PDF documentation <http://deeplearning.net/software/theano/theano.pdf>`_, rather than reading it online.