For "there is no Workflow to setup" -- I think installing a full app is way harder than setting up Github workflow. Sure, for a test usage you can press "deploy to heroku" button, but for a production use you'll want monitoring, security patching, disaster recovery, user authentication... And github gives you all that automatically.
(I'd say differently if you had a large amount of data or a large number of editors... but it seems you only have just over 5000 items and few updates a month, so this will easily fit into a single git repo)
Re "the editor is generated based on the JSON schemas." -- this sounds really interesting! Looking at the public instance I only saw a way to view the data and it was pretty plain, just syntax-highlighted JSON.
If there are some JSON-specific editors, I suggest putting some screenshots in README or on the website somewhere so people can appreciate your work!
(I'd say differently if you had a large amount of data or a large number of editors... but it seems you only have just over 5000 items and few updates a month, so this will easily fit into a single git repo)
Re "the editor is generated based on the JSON schemas." -- this sounds really interesting! Looking at the public instance I only saw a way to view the data and it was pretty plain, just syntax-highlighted JSON.
If there are some JSON-specific editors, I suggest putting some screenshots in README or on the website somewhere so people can appreciate your work!