Kirby
Kirby is a PHP powered CMS that lets you organize your content in folders and write in plain text files with Markdown formatting. That’s it, in a nutshell, and it’s just as simple as it sounds. You can download it for free to try it out (a license will cost $39), upload it to your server, and have a full site up and running literally in minutes. SSH into your server and download it directly from GitHub by commands, and it’ll likely only take a few seconds to have it running.[1]
Then, you just make folders for each page you want, a .txt file with that page’s content, and sub-folders for sub-pages with their own content. Want to add images, or any other content files? You can just add them right in that page’s folder, and can even include an extra text file with more data about that file. Want a special post to have its own CSS and/or Javascript for art-directed posts? That’s easy; just drop the files into that page’s folders.[1]