Fix Simulator screen recordings being at 600 FPS, remove webm videos

lib/util.ts

@@ -71,7 +71,6 @@ export function video(metadata: Metadata, name: string, attributes: object): str
 	return `
 <video ${attributesStr}>
 	<source src="${metadata.permalink}/${name}.mp4" type="video/mp4">
-	<source src="${metadata.permalink}/${name}.webm" type="video/webm">
 </video>
 `;
 }