Add hummingbird favicon

app/views/header.php

@@ -6,6 +6,7 @@
 	<meta http-equiv="cache-control" content="no-store" />
 	<meta http-equiv="Content-Security-Policy" content="script-src 'self'" />
 	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, user-scalable=0" />
+	<link rel="icon" href="/favicon.ico" />
 	<link rel="stylesheet" href="<?= $urlGenerator->asset_url('css.php/g/base') ?>" />
 	<script src="<?= $urlGenerator->asset_url('js.php/g/base') ?>"></script>
 </head>