build(mainpage): Move mainpage(index.html) to base directory

Netlify에 배포할 경우 메인페이지의 index.html 파일이 base directory에
있어야 정상적으로 css와 image가 로드 됨을 확인하고 수정함.

css/home.css

@@ -168,6 +168,7 @@ footer {
 
 .privacy-faq-link {
   display: flex;
+  gap: 10px;
   justify-content: center;
  }
 

pages/index.html → index.html

@@ -21,14 +21,14 @@
           <img class="main-logo" src="/images/logo_with_typo.png" alt="로고 이미지"/>
         </a>
       </div>
-      <button class="login-button" onclick="location.href='./login'">로그인</button>
+      <button class="login-button" onclick="location.href='/pages/login'">로그인</button>
     </header>
     <main>
       <div class="main-top">
         <div class="top-page">
           <div>
             <p class="main-content">일상의 모든 물건을<br>거래해 보세요</p>
-            <button class="item-button" onclick="location.href='./items'">구경하러가기</button>
+            <button class="item-button" onclick="location.href='/pages/items'">구경하러가기</button>
           </div>
           <img
            class="top-img" src="/images/img_home_top.png" alt="홈 페이지 상단 이미지" />
@@ -81,8 +81,8 @@ <h3>Register</h3>
       <div class="footer-bar">
         <div class="codeit-2024">@codeit - 2024</div>
         <div class="privacy-faq-link">
-          <a class= "privacy-link" href="./privacy">Privacy Policy</a>
-          <a class= "faq-link" href="./faq">FAQ</a>
+          <a class= "privacy-link" href="/pages/privacy">Privacy Policy</a>
+          <a class= "faq-link" href="/pages/faq">FAQ</a>
         </div>
         <div>
           <a class="external-link" href="https://www.facebook.com" target="_blank">