refactor(hero): remove redundant scroll cue

The "Jump to the list" anchor duplicated the "Browse the List" button.
Removes the element, its CSS rules, the scroll-line keyframe animation,
and cleans up the offscreen pause and focus-visible selector lists.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

website/templates/index.html

@@ -49,8 +49,6 @@
         </div>
       </div>
     </div>
-
-    <a href="#library-index" class="hero-scrollcue">Jump to the list</a>
   </div>
 </header>
 {% endblock %} {% block content %}