타입 변경

frontend/src/post/intopost.tsx

-import React, { useState } from "react";
-import { useLocation, useParams } from "react-router-dom";
+import React from "react";
+import { useLocation } from "react-router-dom";
+import { PostType } from "../types";
 
 interface PostState {
-  state: {
-    title: string;
-    text: string;
-    theme: string;
-    city: string;
-    date: string;
-    counts: number;
-    _id: string;
-    user: string;
-  };
+  state: PostType;
 }
 
 export function IntoPost() {