Helping those who come after me maintain a website.

Hello fellow programmers!

I have a website I am creating for a non-profit with multiple locations, and I want to know the best approach to take. The styling will be the same for all them, but the actual content should change depending on the location. I want to create the website in a way that is easy for someone who is not technical to update, even if it's only text, images, and links. Any thoughts would be helpful.

I would like to avoid libraries or frameworks, as I want a simple ftp server to reduce costs and complexity for everyone involved.