Move pages configuration to file
What does this Merge Request do?
Some of the gitlab-pages settings can't be used as flags for security reasons.
Currently, in omnibus we pass them through the config file and rest of the settings go to flags.
I think keeping everything in on place is a good idea, so for gdk let's move everything to config file. Maybe we can do the same for omnibus one day.
In the next MR I plan adding support for API configuration and maybe auth later
Closes #980 (closed)
Edited by Jaime Martinez