feat(docs): 为 NormalPage 组件添加 vp-content 属性

更新 NormalPage.vue 组件，为广告容器添加 vp-content 属性，可能是为了改善内容标记或布局

Author: xhofe

docs/.vuepress/components/NormalPage.vue

@@ -1,7 +1,7 @@
 <template>
   <NormalPage>
     <template #contentBefore>
-      <div class="theme-hope-content ads-container">
+      <div class="theme-hope-content ads-container" vp-content>
         <div class="mingdao" v-if="showMingdao">
           <a href="https://www.mingdao.com?s=utm_51=utm_source=alist&utm_medium=banner&utm_campaign=%E5%93%81%E7%89%8C%E6%8E%A8%E5%B9%BF&utm_content=IT%E8%B5%8B%E8%83%BD%E4%B8%9A%E5%8A%A1"
             target="_blank">