Move replay support into the debug panel

index.html

@@ -235,9 +235,6 @@
                     </svg>
                     switch <span class="keyhint">c</span></button>
             </div>
-            <div class="demo-controls">
-                <button class="demo-play" type="button">View replay</button>
-            </div>
         </div>
     </main>
     <main id="editor" hidden>