That makes me really happy because it felt like somewhat of a design risk at the time.
This is a brilliant way of doing it.
It makes perfect sense to me. I love the graphics that illustrate what the docs relate to. I don't need to do a lot of prior reading to grasp the lexicon being used.
You've nailed the icon design, that's really hard to do right.
I've never used FullCalendar, however that is an excellent docs layout. Immediately obvious. Very well done.