fix: remove overflow-hidden from div#content (ietf-tools#3681)

Allows position="sticky" items to attach to the viewport instead of the #content element.

Author: jennifer-richards

ietf/templates/base.html

@@ -84,7 +84,7 @@
                         </ul>
                     </div>
                 {% endif %}
-                <div class="col overflow-hidden mx-lg-3 ietf-auto-nav" id="content">
+                <div class="col mx-lg-3 ietf-auto-nav" id="content">
                     <noscript>
                         <div class="alert alert-danger alert-ignore my-3">
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