Fix lint

Author: guanquann

frontend/src/pages/NewQuestion/index.tsx

@@ -7,7 +7,7 @@ import { ToastContainer, toast } from "react-toastify";
 import "react-toastify/dist/ReactToastify.css";
 
 import { questionClient } from "../../utils/api";
-import { complexityList, categoryList } from "../../utils/constants";
+import { complexityList } from "../../utils/constants";
 import AppMargin from "../../components/AppMargin";
 import QuestionMarkdown from "../../components/QuestionMarkdown";
 import QuestionImageContainer from "../../components/QuestionImageContainer";