Change the debug trigger to something more accessible

index.html

@@ -14,7 +14,7 @@
 </head>
 <body data-mode="splash">
     <header id="header-main">
-        <img src="icon.png" alt="">
+        <img id="header-icon" src="icon.png" alt="">
         <h1>Lexy's Labyrinth</h1>
         <p>— a game by <a href="https://eev.ee/">eevee</a></p>
         <nav>