Fixes for accessibility

Author: gokulkrishh

app/index.html

@@ -5,7 +5,7 @@
     <title>QR Code Scanner</title>
     <meta http-equiv=X-UA-Compatible content="IE=edge">
     <meta name=description content="QR Code Scanner is the fastest and most user-friendly web application.">
-    <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no">
+    <meta name="viewport" content="width=device-width,initial-scale=1.0">
     <meta name="mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-title" content="QR Scanner"/>
     <meta name="apple-mobile-web-app-status-bar-style" content="#e4e4e4">