- export from slack https://get.slack.help/hc/en-us/articles/201658943-Export-your-team-s-Slack-history
- convert with this
- import to scrapbox https://scrapbox.io/help/%E3%82%A4%E3%83%B3%E3%83%9D%E3%83%BC%E3%83%88%E3%83%BB%E3%82%A8%E3%82%AF%E3%82%B9%E3%83%9D%E3%83%BC%E3%83%88%E3%81%99%E3%82%8B
added 2022.py