remove unused lang icons, disable text selection

client/ui/frontend/index.html

@@ -4,6 +4,9 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>NetBird</title>
+    <style>
+      html, body { background: #181A1D; }
+    </style>
   </head>
   <body>
     <div id="root"></div>