Let’s start to show the amazing power of livebooks without even touching custom code.
First install livebook from this site: https://livebook.dev/
This provides a host to run a livebook.
Start a new livebook

Paste in the following url then hit enter:
https://github.com/chriseyre2000/livebooks/blob/main/EventStorming.livemd
You now have a local copy of my mermaid starter for Event Storming.
Yes livebooks allow you to open sample pages that happen to be sitting on a website.
If you click on the edit button that gives you the ability to see the source used to create this.
How over the main image and hit +Block and you can add another diagram block and copy and edit the key that I created.
Theoretically these can be edited collaberatively.