Fix favicon.ico

Signed-off-by: Ricardo Zanini <zanini@redhat.com>

Author: ricardozanini

.DS_Store

@@ -22,7 +22,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
     <meta property="og:type" content="website">
     <title>Serverless Workflow</title>
-    <link rel="icon" type="image/png" href="img/sw-logo-header.png">
+    <link rel="icon" type="image/x-icon" href="img/favicon.ico?v=2">
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
     <link rel="stylesheet"