Remove Wi-Fi announcement block from slides

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

index.html

@@ -1864,11 +1864,6 @@ footer {
 </head>
 <body>
   <div class="slide-counter" id="slide-counter" aria-hidden="true">— 1 —</div>
-  <aside class="vibe-announce" aria-label="Объявление">
-    <div class="vibe-announce-title">Wi-Fi и пароль</div>
-    <div>VIBECODING</div>
-    <div class="vibe-announce-pass">123456789</div>
-  </aside>
   <div class="frame">
 
     <!-- NAV -->