This site is built using Unplatformed Designed, the idea of creating new technologies on top of existing platforms in new and novel ways. Instead of re-building a Content Management System, configuring user authentication and building collaborative editing interfaces, we're using Trello for all those things.
How does it work?
We created a system on top of Trello, using it as our database and getting all of its awesome features for free. You sign in and edit cards on Trello then it automatically regenerates the website with the changes.
This is what the Trello board behind this site looks like.
All of the code for this site is open source and you can find it at github.com/unplatform/husky-cms.