What engine does the site run on and how is it connected to Github?

Question

CMS

Hello.
I wrote a good commentary on the housing law of the city of Moscow.
I would like to post it online.
The ideal display of the tutorial is like this
learn.getgrav.org
Tell me please, is this some kind of engine?
I also see that it is tied to the github (I'm not special)
Is it somehow connected?
Thanks
, the longer the comment, the better.

Answer 1

This is the GRAV engine. And you can download it there .

Answer 2

docs.modx.pro

Answer 3

yeah)
but can’t you say, such a conclusion, in the form of a table of contents, is a standard feature? well, if you know