Switch to sphinx 7's intersphinx_mapping usage. (#1767)

https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html#confval-intersphinx_mapping

Author: tim-schilling

docs/conf.py

@@ -59,8 +59,11 @@
 # html_static_path = ['_static']
 
 intersphinx_mapping = {
-    "https://docs.python.org/": None,
-    "https://docs.djangoproject.com/en/dev/": "https://docs.djangoproject.com/en/dev/_objects/",
+    "python": ("https://docs.python.org/", None),
+    "django": (
+        "https://docs.djangoproject.com/en/dev/",
+        "https://docs.djangoproject.com/en/dev/_objects/",
+    ),
 }
 
 # -- Options for Read the Docs -----------------------------------------------