Multiple 404 on that page:

http://www.rubydoc.info/github/yast/yast-yast2/

http://yast-core.readthedocs.org/en/latest/

I am not trying to make you angry, but I think I put the finger right on the place where it hurts very much.

There is no clear documentation about what yast does or what it will not do - basically a blackbox. Maybe it will change apache config. Maybe not. Who knows.