export simple notion page to hexo post with cmdline

1. export notion page to hexo post in local repo within cmd
2. push to github repo

1. add export.py and notion2post.sh to hexo-blog root(in the same dir as _config.yml)
2. choose python env and update the notion token in notion2post.sh
   • the env must install the required package by pip install -r requirments.txt
3. use the shell to export notion page bash notion2post.sh