This is a basic example page of hagel. See there for more info about hagel.
A rendered version of this example can be found here: http://patrickbrosi.de/hagelexample
The about page automatically fetches the README of the hagel repo and converts it via pandoc. On Ubuntu, for example, you can install pandoc like this:
sudo apt-get install pandoc
To render this page, type
make
and access html/en/index.html.
GPL v2. The bootstrap theme used here can be found here