Remove unused assets and fix FA

assets/vendor.js

 // FA
-import 'admin-lte/plugins/fontawesome-free/css/all.min.css';
-
-// select2
-import 'admin-lte/plugins/select2/css/select2.min.css';
+import 'admin-lte/plugins/fontawesome-free/css/fontawesome.css';
+import 'admin-lte/plugins/fontawesome-free/css/regular.css';
+import 'admin-lte/plugins/fontawesome-free/css/solid.css';
 
 // AdminLTE
 import 'admin-lte/build/scss/adminlte.scss';