Update index.html

Added the music gallery button

index.html

@@ -95,7 +95,7 @@ <h1>Freakybob</h1>
 
     <!-- Mute/Unmute Button -->
     <button id="mute-button">Mute Music</button>
-
+<a href="Musicgallery.html"><button>Listen to Spongebob music!</button>
     <script>
         const popup = document.getElementById('sound-popup');
         const yesButton = document.getElementById('yes-button');