feat(getPageContentText): update getPageContentText to use post.content array

- modify content extraction logic to use post.content array
- avoid extra but wrong result by checking pageBlockMap.block

lib/notion/getPageContentText.js

@@ -84,12 +84,12 @@ export function getPageContentText(post, pageBlockMap) {
   }
 
   const postId = post.id
+  const postContent = post.content
   let contentTextList = []
   // 防止搜到加密文章的内容
-  if (pageBlockMap && pageBlockMap.block && !post.password) {
-    const contentIds = Object.keys(pageBlockMap.block)
-    for (const id of contentIds) {
-      const blockContentText = getBlockContentText(id)
+  if (postContent.length > 0 && !post.password) {
+    for (const postContentId of postContent) {
+      const blockContentText = getBlockContentText(postContentId)
       if (blockContentText) {
         contentTextList.push(blockContentText)
       }