I was initially confused how this could work, since GitHub pages is only for static hosting, but it turns out you use it by pushing notes to your repo, and Precis acts as more of a viewer/organizer for your notes (if I am understanding it correctly). I don't know if I would call it a note-taking app, since the actual note taking part is on your own computer rather than on the website, but it is pretty cool. Very pretty!
+1, especially since all notes are public.
To me, it looks like the right balance between the Twitter and an actual blog. I may give it a try. Nice job!
Seems like interesting way to utilize GitHub. Kudos!