Fixes room list, adds OpenGraph so link previews look good

public/menu.html

@@ -3,6 +3,8 @@
 <head>
   <meta charset="UTF-8"/>
   <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <meta property="og:title" content="Y.A.R.N HTML5" />
+  <meta property="og:description" content="A collaborative story-writing game. Remake of the 2000s GameSpy Arcade classic." />
   <title>Y.A.R.N. 2026</title>
 
   <!-- re-use the same CSS-variables and base look -->