Add relative favicon.ico

Author: Peter Blood

index.html

@@ -18,6 +18,10 @@
     <meta property="og:description" content="A fun little recreation of the classic Asteroids game in 100% vanilla JavaScript" />
 
     <title>Asteroids - by Rayzr522</title>
+
+    <link rel="icon" href="favicon.ico" type="image/x-icon"/>
+    <link rel="shortcut icon" href="favicon.ico" type="image/x-icon"/>
+
     <style>
         body {
             background: black;