To me, that just calls for a sensible UI with attractive styling and interaction over a git backend for the heavy lifting of tracking changes through time.
A lot of successful products have been built in this way. I've seen developers get upset with Apple for making successful products out of just giving a nice UI to a piece of open source tech that does the heavy lifting. Like it's cheating.
You should research what happened with distros and UI systems...open source was building lots of nice UIs and you could even have them on Windows/Mac, but the was constant drama over the "right" way to code a UI framework...which led to a ton of fracturing and leaning back towards minimalism (because the nice stuff was always very heavy).
This even happened with Microsoft, they had so many false starts and changes in messaging that they killed their own portfolios. I suspect at least that is why they "embraced linux" because it was excellent at web, and web wasn't busy changing every month (it has been, but that's a different story).
Apple introduced Swift but besides new Xcode versions I get the general impression their tooling has been far more stable.
A lot of successful products have been built in this way. I've seen developers get upset with Apple for making successful products out of just giving a nice UI to a piece of open source tech that does the heavy lifting. Like it's cheating.