Optimize the static files

- Use webfont version of FontAwesome
- Use CDN for UIKit JS files

src/views/login.html.ecr

@@ -30,8 +30,7 @@
     <script>
       setTheme();
     </script>
-    <script src="<%= base_url %>js/uikit.min.js"></script>
-    <script src="<%= base_url %>js/uikit-icons.min.js"></script>
+    <%= render_component "uikit" %>
   </body>
 
 </html>