Update draw-web-worker/index.html

draw-web-worker/index.html

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     <meta name="viewport" content="width=device-width">
     <meta name="viewport" content="initial-scale=1">
     <link href="style.css" rel="stylesheet" type="text/css">
-    <link href="../favicon.svg" rel="icon" type="image/svg+sml">
+    <!--link href="../favicon.svg" rel="icon" type="image/svg+sml"-->
     <script defer src="main.js"></script>
     <title>Draw simple shapes</title>
 </head>
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 </header>
 
 <main>
+    <p><a href="../index.html">Back to homepage</a></p>
     <h1>Draw some shapes with simple Web Workers API</h1>
     <p>
         To view the message between the main and the Worker,