Allow request manifest through reverse proxy with authentication
<link rel="icon" type="image/png" sizes="32x32" href="/[{[ .StaticURL ]}]/img/icons/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/[{[ .StaticURL ]}]/img/icons/favicon-16x16.png">
<!-- Add to home screen for Android and modern mobile browsers -->
- <link rel="manifest" id="manifestPlaceholder">
+ <link rel="manifest" id="manifestPlaceholder" crossorigin="use-credentials">
<meta name="theme-color" content="#2979ff">
<!-- Add to home screen for Safari on iOS -->
