Well, the CMS is the classical way to do it. Using Jekyll and Github is a more recent and innovative way to do stuff, much simpler to use for developers and cheaper because it's free hosting that can scale pretty well.

Of course if you want marketing people to edit stuff asking them is use Git is going to be painful.

Install the GitHub app, then tell them to follow these steps: 1) Make your changes. 2) Write a word or two about the changes here (commit subject). 3) Press this button (commit) to record the changes. (repeat 1-3 if desired) 4) Press this button (sync) to sync your changes with your colleagues.

Yea, unfortunately this isn't the best setup for non-technical users, but I think it can still be decently done through the github editing features they recently added. I probably won't use this for some of our more content-heavy sites, but I've grown to appreciate hosting static content on Github pages.

This is for project docs and such, not for marketing people but for the people working on the project.