I revisited the project and fixed some bugs, made a few improvement and added Markdown support for posts.
https://github.com/marciovmf/static/releases

On the left, the website structure. The site.txt and the Posts and themes folders. In the middle, the a portion of the source of the demo site index.html. The highlighted area displays a snipped of code that iterates all posts in order to render a links for each one of them along with their title and their creation date. It's worth noting the list is sorted by post creation date in ascending order.

A bit further, another loop iterating all "pages". Any html file in the current theme folder is considered a page and can be iterated and queried like a post.

As I said, there isn't much to a static site generator and that is why I believe this kind of tool should be simple and less bloated.

Building the website via command line is simple and of course, very fast

Minimum configuration is required. Convention is preferred over configuration for the most common task, that is adding posts.

Adding content is just a matter of adding html files to the Posts folder.
The post file name states the template used to render the post, the post creating date and the post title