chore(getPageContentText): add todo comments for future improvements

- Add todo comment for cleaning up more useless tags
- Add todo comment for handling more block types

lib/notion/getPageContentText.js

@@ -24,6 +24,7 @@ export function getPageContentText(post, pageBlockMap) {
     return ''
   }
 
+  // todo: 清除更多无用标签
   const removeTypeFlag = ['a', 'p', '‣']
 
   /**
@@ -67,6 +68,7 @@ export function getPageContentText(post, pageBlockMap) {
   function getBlockContentText(id) {
     const block = pageBlockMap?.block[id].value
     const blockType = block.type
+    // todo: 处理更多类型
     switch (blockType) {
       case 'transclusion_reference':
         return getTransclusionReference(block)