There definitely is a market for a product like this. I think the best thing would be a native app with deep git integration. Engineers can see the entire project and edit templates while end users get a GUI to drag and drop those templates to make an article. The output from the user is encoded to either json or protobufs, and then passed through a function that outputs html which is then uploaded to s3. Everything would be under version control so you could just operate as if it were a custom designed webpage. You could fund development by having a store that takes a cut of templates that other people create.

I would work on this if I wasn't already running another startup.