Don't show logo in docs/introduction.txt (only in README)

docs/includes/introduction.txt

@@ -1,5 +1,3 @@
-.. image:: http://cloud.github.com/downloads/ask/celery/celery_favicon_128.png
-
 :Version: 2.0.0
 :Web: http://celeryproject.org/
 :Download: http://pypi.python.org/pypi/celery/

docs/templates/readme.txt

@@ -2,6 +2,8 @@
  celery - Distributed Task Queue
 =================================
 
+.. image:: http://cloud.github.com/downloads/ask/celery/celery_favicon_128.png
+
 .. include:: ../includes/introduction.txt
 
 .. include:: ../includes/resources.txt