Fix nav-list-expander positioning for menu visibility (#19)

* Initial plan

* Initial plan for menu visibility investigation

Co-authored-by: alexeygrigorev <875246+alexeygrigorev@users.noreply.github.com>

* Fix nav-list-expander positioning - add top and left positioning

Co-authored-by: alexeygrigorev <875246+alexeygrigorev@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexeygrigorev <875246+alexeygrigorev@users.noreply.github.com>

Author: Copilot

Gemfile.lock

@@ -86,7 +86,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    io-event (1.14.2)
+    io-event (1.11.2)
     jekyll (4.4.1)
       addressable (~> 2.4)
       base64 (~> 0.2)

_sass/navigation.scss

@@ -67,8 +67,11 @@
 
     .nav-list-expander {
       position: absolute;
+      top: 0;
       @if $nav-list-expander-right {
         right: 0;
+      } @else {
+        left: 0;
       }
 
       width: $nav-list-item-height-sm;