Fix PWA implementation to support standard using html link tag

resources/views/site/index.blade.php

@@ -20,6 +20,7 @@
 	<meta name="medium" content="image">
 	<meta name="theme-color" content="#10c5f8">
 	<meta name="apple-mobile-web-app-capable" content="yes">
+	<link rel="manifest" href="/manifest.json">
 	<link rel="shortcut icon" type="image/png" href="/img/favicon.png?v=2">
 	<link rel="apple-touch-icon" type="image/png" href="/img/favicon.png?v=2">
 	<link href="{{ mix('css/landing.css') }}" rel="stylesheet">