Signup screen and functionality

frontend/lib/agent_screen.dart

@@ -7,6 +7,8 @@ class ConfigField {
   final String name;
   final String type;
   final TextEditingController controller;
+  // There should be an additional property to indicate whether this field is deactivated/removed/reset
+  // meaning it will be set as 'null' (default) rather than any string, otherwise only an empty string can be set
 
   ConfigField({required this.name, required this.type, required this.controller});
 }