新增：初步使用gitalk集成评论功能

repos/.vitepress/theme/components/MyLayout.vue

@@ -1,13 +1,14 @@
 <template>
   <Layout>
-    <template #doc-footer-before>
-      
+    <template #doc-after>
+      <Comment />
     </template>
   </Layout>
 </template>
 
 <script lang="ts" setup>
 import DefaultTheme from 'vitepress/theme'
+import Comment from './Comment.vue'
 
 const { Layout } = DefaultTheme
 </script>