[3.14] Docs: use a Sphinx extension to eliminate excessive links (GH-145130) (#145575)

Docs: use a Sphinx extension to eliminate excessive links (GH-145130)
(cherry picked from commit 15f6479)

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

Author: miss-islington

Doc/conf.py

@@ -42,6 +42,7 @@
 
 # Skip if downstream redistributors haven't installed them
 _OPTIONAL_EXTENSIONS = (
+    'linklint.ext',
     'notfound.extension',
     'sphinxext.opengraph',
 )

Doc/requirements.txt

@@ -18,4 +18,6 @@ sphinx-notfound-page~=1.0.0
 # to install that as well.
 python-docs-theme>=2023.3.1,!=2023.7
 
+linklint
+
 -c constraints.txt