[Feature] Have a way to collaborate

Since this only saves data in the browser there is no way to have 2 people working on the same diagram at the same time. But as a workaround it would be nice if I could save the diagram to a file in our repo, then when someone wants to edit / view it they can run a docker image locally that would read the file and load the diagram into the local instance. They would still need to export the file afterwords and commit unless there could be a feature to only read/write to a file instead of indexedDB.