Revert "Fix all Python Cookbook links (#22205)" (GH-22424)

This commit reverts commit ac0333e1e117b7f61ed7ef1dbcdb6e515ada603b as the original links are working again and they provide extended features such as comments and alternative versions.
diff --git a/Doc/library/difflib.rst b/Doc/library/difflib.rst
index 009b797..aa08988 100644
--- a/Doc/library/difflib.rst
+++ b/Doc/library/difflib.rst
@@ -633,7 +633,7 @@
      work.
 
    * `Simple version control recipe
-     <https://github.com/ActiveState/code/tree/master/recipes/Python/576729_Simple_Version_Control/recipe-576729.py>`_ for a small application
+     <https://code.activestate.com/recipes/576729/>`_ for a small application
      built with :class:`SequenceMatcher`.