doc: remove django intersphinx mapping

Initially I just wanted to fix http -> https, but I think it's not worth
having at all just for this one reference.

Author: bluetech

doc/en/conf.py

@@ -382,18 +382,13 @@
 ]
 
 
-# Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
     "pluggy": ("https://pluggy.readthedocs.io/en/stable", None),
     "python": ("https://docs.python.org/3", None),
     "numpy": ("https://numpy.org/doc/stable", None),
     "pip": ("https://pip.pypa.io/en/stable", None),
     "tox": ("https://tox.wiki/en/stable", None),
     "virtualenv": ("https://virtualenv.pypa.io/en/stable", None),
-    "django": (
-        "http://docs.djangoproject.com/en/stable",
-        "http://docs.djangoproject.com/en/stable/_objects",
-    ),
     "setuptools": ("https://setuptools.pypa.io/en/stable", None),
 }
 

doc/en/how-to/plugins.rst

@@ -21,7 +21,7 @@ there is no need to activate it.
 Here is a little annotated list for some popular plugins:
 
 * :pypi:`pytest-django`: write tests
-  for :std:doc:`django <django:index>` apps, using pytest integration.
+  for `django <https://docs.djangoproject.com/>`_ apps, using pytest integration.
 
 * :pypi:`pytest-twisted`: write tests
   for `twisted <https://twistedmatrix.com/>`_ apps, starting a reactor and