Feature request: support Github as a syncing backend

[iamkarlson]

I'm new in org-mode world, and trying to setup mobile setup of any kind. I stumbled upon this incredible project, but regretfully I can't use it right away. I don't have a personal Gitlab account, and it would be a problem to make one (it would conflict with all the sessions I have for thr wotk account on my phone). Also, I'm not using Google Drive because of the privacy concerns. However, I'm able to setup WebDav storage but it's too much hassle and additional cost per month if I want my notes to be accessible everywhere via some cloud.

On the other side, Github is a popular solution to store such private repos with notes. It would be great (and I believe for project adoption too) to support Github as a syncing backend.