See demo on http://blankstrap.com and scroll slowly up and down. The navigation bar will disappear when scrolling down and appear again when scrolling up. Thats an optional setting you have to enable in the theme settings.
Excuse me that I was a bit unloquacious. If you use the markdown folder integration and have defined a header image, but no metadata image, the header image is now used as metadata image also automatically.
@Jannis This is a fantastic feature addition! Wow, very simple to implement. For my course websites it is now much much easier for my students to be able to download a whole folder of materials in one click rather than downloading each file one by one.
I also noticed that if a folder has sub-folders the zip process works equally smoothly. Brilliant!
Yes, indeed, Jannis as @mitchellm says is an excellent update on your brilliant Repository Stack. Looking forward to the next updates / feature additions 🙂