Backport PR #32870 on branch 1.0.x (DOC: Remove latest whatsnew from header) (#34003)

Co-authored-by: Tom Augspurger <[email protected]>

Author: simonjayhawkins

doc/source/index.rst.template

@@ -119,7 +119,6 @@ programming language.
     :titlesonly:
 {% endif %}
 {% if not single_doc %}
-    What's New in 1.0.1 <whatsnew/v1.0.1>
     getting_started/index
     user_guide/index
     {% endif -%}