DOC: add note to old third party, and orphan it

jklymak · jklymak · commit a539be8309ea · 2021-04-20T07:23:01.000-07:00
diff --git a/doc/thirdpartypackages/index.rst b/doc/thirdpartypackages/index.rst
@@ -1,4 +1,10 @@
-.. _thirdparty-index:
+:orphan:
+
+.. note:: 
+
+    This page has been moved to <https://matplotlib.org/mpl-third-party> 
+    where you will find an up-to-date list of packages.  
+
 
 ********************
 Third party packages
