Backport PR pandas-dev#48623: REGR/DOC: Docs left navbar broke

Author: rhshadrach

doc/_templates/sidebar-nav-bs.html

@@ -1,5 +1,5 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
-  <div class="bd-toc-item active">
+  <div class="bd-toc-item navbar-nav">
     {% if pagename.startswith("reference") %}
     {{ generate_toctree_html("sidebar", maxdepth=4, collapse=True, includehidden=True, titles_only=True) }}
     {% else %}