Update sidebar button with .attention-blink

Author: HappySeaFox

public/index.html

@@ -76,7 +76,7 @@
         <div class="d-flex align-items-center py-3">
           <!-- Sidebar toggle button -->
           <div>
-            <button class="btn btn-light" data-bs-toggle="offcanvas" data-bs-target="#offcanvas">
+            <button class="btn btn-light attention-blink" data-bs-toggle="offcanvas" data-bs-target="#offcanvas">
               <img src="open.svg" width="12" height="21" alt="Options">
             </button>
           </div>