Update Discord link to new Meta experience

Author: muzerly

index.html

@@ -162,7 +162,7 @@ <h1 class="title" data-testid="title">NightClub Simulator VR</h1>
     <a
       class="discord-btn"
       data-testid="discord"
-      href="https://discord.gg/WSR79KAGyw"
+      href="https://www.meta.com/experiences/nightclub-simulator-vr/5332536576829015/"
       target="_blank"
       rel="noopener noreferrer"
       aria-label="Join our Discord server"