Author here. You're completely right about the GitHub specific implementation. I made a mistake in the title! Right now only GitHub auth is supported. Although the design should work with any Git repo down the line. Sorry for causing confusion. Unfortunately I can't edit the title now. I will add a comment to explain this limitation.
As for the tech stack, I chose JS because the main goal was a lightweight web UI that handles online editing and easy image uploads, and JS sounded like a better fit. Having said that, I'm also not happy with current state of npm and I will look into an implementation with Go and tmpl.
As for the tech stack, I chose JS because the main goal was a lightweight web UI that handles online editing and easy image uploads, and JS sounded like a better fit. Having said that, I'm also not happy with current state of npm and I will look into an implementation with Go and tmpl.