Add icon to admin page sidebar

* follow up to nextcloud/server#3151

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

css/style.css

@@ -18,4 +18,9 @@
 	vertical-align: sub;
 	margin-left: -2px;
 	margin-right: 3px;
+}
+
+/** icons for personal page settings **/
+.nav-icon-u2f-second-factor-auth {
+	background-image: url('../img/app-dark.svg?v=1');
 }

img/app-dark.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 64 64" height="64" width="64">
+ <g fill="#000" transform="translate(0 -988.36)">
+  <path d="m49.201 6.3711l-8.931 8.9299-1.084-1.084c-0.719-0.719-1.875-0.719-2.594 0l-29.996 29.994c-0.7191 0.719-0.7191 1.875-0.0003 2.594l10.597 10.599c0.719 0.719 1.877 0.719 2.596 0l29.994-29.996c0.719-0.719 0.719-1.875 0-2.594l-0.795-0.796 8.93-8.93-8.717-8.7169zm-1.064 3.3144l1.17 1.1695-6.198 6.2-1.171-1.172 6.199-6.1975zm0.531 2.7305l1.172 1.172-5.129 5.129-1.172-1.17 5.129-5.131zm1.754 1.693l1.172 1.172-5.129 5.129-1.172-1.172 5.129-5.129zm2.783 0.623l1.17 1.172-6.197 6.198-1.172-1.17 6.199-6.2zm-27.705 16.268a3.5 3.5 0 0 1 3.461 3h7.039v1h-1v2h-1v-2h-1v1h-1v-1h-3.041a3.5 3.5 0 0 1 -3.459 3 3.5 3.5 0 0 1 -3.5 -3.5 3.5 3.5 0 0 1 3.5 -3.5zm0 1a2.5 2.4999 0 0 0 -2.5 2.5 2.5 2.4999 0 0 0 2.5 2.5 2.5 2.4999 0 0 0 2.5 -2.5 2.5 2.4999 0 0 0 -2.5 -2.5z" fill="#000" stroke-width=".11525px" fill-rule="evenodd" stroke="#fff" transform="translate(0 988.36)"/>
+ </g>
+</svg>