Temporary workaround to get FontAwesome icons working.

core/admin/assets/app.css

@@ -20,3 +20,11 @@
 .sidebar-toggle {
   padding: unset !important;
 }
+
+/* 
+ * Temporary workaround to get FontAwesome icons working. 
+ * Should be updated if AdminLTE is updated to use the same version. 
+ * This workaround can be removed if someone gets the icons working
+ * again via the plugins included with AdminLTE
+  */
+@import url("//use.fontawesome.com/releases/v5.15.3/css/all.css");