[docs] Updated links to the Django docs

Author: nemesifier

developer/google-code-in.rst

@@ -231,7 +231,7 @@ Programming languages and frameworks:
     - `Python
       <https://runestone.academy/runestone/static/pythonds/index.html>`_
       (book)
-    - `Django <https://docs.djangoproject.com/en/1.11/>`_ (official
+    - `Django <https://docs.djangoproject.com/>`_ (official
       documentation)
     - `Lua <https://www.youtube.com/watch?v=iMacxZQMPXs/>`_ (video
       tutorial)

developer/google-summer-of-code.rst

@@ -151,7 +151,7 @@ Programming languages and frameworks:
     - `Python
       <https://runestone.academy/ns/books/published/pythonds/index.html>`_
       (book)
-    - `Django <https://docs.djangoproject.com/en/1.11/>`_ (official
+    - `Django <https://docs.djangoproject.com/>`_ (official
       documentation)
     - `Lua <https://www.youtube.com/watch?v=iMacxZQMPXs/>`_ (video
       tutorial)