Ability to have branches, much like with git version control

It would be much easier to collaborate if something like git version control were added to Builder. This way, there would be less of a fear of overwriting someone's work or accidentally publishing something that isn't ready. It would be nice to then have a concept of creating a pull request, like in GitHub, merging these branches and having the ability to resolve merge conflicts.

This feature exists on Webflow: https://webflow.com/feature/page-branching