refactor: remove unnecessary comments and hidden link from index.html

index.html

@@ -6,14 +6,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Classworks 作业板</title>
 
-    <!-- SEO -->
     <meta name="description" content="Classworks —— 适用于班级大屏的作业板小工具，支持记录、查看并同步作业，开源免费。" />
     <meta name="keywords" content="Classworks,作业板,班级大屏,作业管理,课表,作业同步,开源" />
     <meta name="author" content="Sunwuyuan" />
     <meta name="robots" content="index, follow" />
     <link rel="canonical" href="https://cs.houlang.cloud/" />
 
-    <!-- Open Graph -->
     <meta property="og:type" content="website" />
     <meta property="og:title" content="Classworks 作业板" />
     <meta property="og:description" content="适用于班级大屏的作业板小工具，支持记录、查看并同步作业，开源免费。" />
@@ -24,7 +22,6 @@
     <meta property="og:image:height" content="512" />
     <meta property="og:locale" content="zh_CN" />
 
-    <!-- Twitter Card -->
     <meta name="twitter:card" content="summary" />
     <meta name="twitter:title" content="Classworks 作业板" />
     <meta name="twitter:description" content="适用于班级大屏的作业板小工具，支持记录、查看并同步作业，开源免费。" />
@@ -39,6 +36,5 @@
 
     <div id="app"></div>
     <script type="module" src="/src/main.js"></script>
-    <a href="https://beian.miit.gov.cn/" target="_blank" rel="noopener" style="display: none;">xICP备x号-4</a>
   </body>
 </html>