Update theme color

Author: zsevic

_layouts/default.html

@@ -14,6 +14,7 @@
     <link rel="stylesheet" href="{{ '/assets/css/ie.css' | relative_url }}">
     <![endif]-->
     <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+    <meta name="theme-color" content="#2F3C7E">
     <link rel="icon" href="favicon.svg">
 
   </head>