Update file structure of add question frontend

Author: guanquann

frontend/src/components/NewQuestion/QuestionImage.tsx renamed to frontend/src/components/NewQuestion/QuestionImage/index.tsx

@@ -4,8 +4,8 @@ import { Button, ImageList, ImageListItem } from "@mui/material";
 import FileUploadIcon from "@mui/icons-material/FileUpload";
 import "react-toastify/dist/ReactToastify.css";
 
-import QuestionImage from "./QuestionImage";
-import QuestionImageDialog from "./QuestionImageDialog";
+import QuestionImage from "../NewQuestion/QuestionImage";
+import QuestionImageDialog from "../QuestionImageDialog";
 
 const FileUploadInput = styled("input")({
   height: 1,

frontend/src/components/NewQuestion/QuestionImageContainer.tsx renamed to frontend/src/components/QuestionImageContainer/index.tsx

@@ -6,11 +6,11 @@ import { ToastContainer, toast } from "react-toastify";
 import "react-toastify/dist/ReactToastify.css";
 import { v4 as uuidv4 } from "uuid";
 
-import { storage } from "../firebase";
+import { storage } from "../../firebase";
 import { getDownloadURL, ref, uploadBytesResumable } from "firebase/storage";
 
-import QuestionMarkdown from "../components/NewQuestion/QuestionMarkdown";
-import QuestionImageContainer from "../components/NewQuestion/QuestionImageContainer";
+import QuestionMarkdown from "../../components/QuestionMarkdown";
+import QuestionImageContainer from "../../components/QuestionImageContainer";
 
 // hardcode for now
 const difficultyList: string[] = ["Easy", "Medium", "Hard"];