DOC: Remove latest whatsnew from header (#32870)

Author: TomAugspurger

doc/source/index.rst.template

@@ -119,7 +119,6 @@ programming language.
     :titlesonly:
 {% endif %}
 {% if not single_doc %}
-    What's New in 1.1.0 <whatsnew/v1.1.0>
     getting_started/index
     user_guide/index
     {% endif -%}