Auto merge of #2047 - Turbo87:manifest, r=locks

Add missing `ember-web-app` tags

see https://zonkyio.github.io/ember-web-app/docs/getting-started/installation

r? @locks

Author: bors

app/index.html

@@ -12,6 +12,9 @@
     <link rel="stylesheet" href="{{rootURL}}assets/vendor.css">
     <link rel="stylesheet" href="{{rootURL}}assets/cargo.css">
 
+    <link rel="manifest" href="{{rootURL}}manifest.webmanifest">
+    <meta name="msapplication-config" content="{{rootURL}}browserconfig.xml">
+
     {{content-for 'head-footer'}}
     <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
     <link rel="icon" href="/cargo.png" type="image/png">