Something Overleaf [1] might help -- it's an online collaborative LaTeX editor with a rich text mode [2] to help make it easier for non-LaTeX users to collaborate on LaTeX docs. If you do use it, feedback would be appreciated -- I'm one of the founders :)

We also published a short post on 'the stoic resilience of the PDF within the digital ecosystem' recently [3], which seems relevant...although it's just a short background piece.

[1] https://www.overleaf.com

[2] https://www.overleaf.com/blog/81

[3] https://www.overleaf.com/blog/509