Removed link to now-dead Dive into Python website. by: Giles

Author: gpjt

helpers/1-start_python.md

@@ -96,9 +96,5 @@ should now be able to follow them on PythonAnywhere. Here are some of our favori
 
 There is also [a big list of python tutorials](https://wiki.python.org/moin/BeginnersGuide/NonProgrammers) on the Python wiki.
 
-If you already know some programming have a look at:
-
- * [Dive into Python](http://www.diveintopython3.net/)
-
 Good luck on your journey into the world of Python!