I know Drupal better than other CMSs and it fits the requirements although static generation is not out of the box but supported by a module(like most things in Drupal). Content is usually created and modified through a web interface that offers either source code view or a WYSIWYG GUI but can be template based using text files on disk.

Can anyone explain a bit how Jekyll would work in the context of the Tor website? Do users need to create the content on disk or through a web interface?