Update README.rst

Fixe link to documentation page : 'Backbone.js Stack'

README.rst

@@ -4,7 +4,7 @@ Backbone Bootstrap is a Javascript stack based on :
  * `Backbone.js <https://github.com/jashkenas/backbone>`_
  * `Underscore.js <https://github.com/jashkenas/underscore>`_
 
-`RESThub Backbone stack documentation <http://resthub.org/backbone-stack.html>`_.
+`RESThub Backbone stack documentation <http://resthub.org/docs/backbone/>`_.
 
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