I have a quite broad question that I don't know where I should ask.
I'll try to explain from a very general perspective: I want to put text into some structure (like json) and generate from that something that can be converted into a handful of languages (like html, markdown or latex, I would like not to constrain that yet) so that from those languages something readable can be generated in different formats (pdf, docx, a webpage, a wiki site). The original structure should be readable and play well with github too.
The question is how to structure that information/text so that it fits to be easily converted to other formats, read by humans and checked diffs (branches, etc.) in Github.
It's a usability question that involves not only languages and programming but also technologies, usability and much more. I'm not sure whether stackoverflow is broad enough or I should go somewhere else (or nowhere else).
I tried to summarize the question, I can add more details if needed (sorry if there are too many now). Thank you.