While this is a fun project for JAMstack there are some limitations.

1. Multiple authors are possible but the latest edit becomes your published date.
2. The edits and updates can be tracked in Trello to check if point 1 happens.
3. Acknowledge you are using Trello for experiment/fun.

This demo shows how Sapper could be used for any headless CMS or other API solutions even Shopify has a headless mode.

This demo is also hosted here https://trello.anoram.com/

Check the repo here: https://github.com/peopledrivemecrazy/Sapper-Trello