No official documentation available

[Schtailian]

Hi, i am building a new site on modx and saw that no real documentation is available.

• There is only this site, which tells you how to install it.
• This site links to that site which is not available.

I think this should be in the official docs and not on a separate site.

Let me know how you want to deal with this. I would be happy to take on this work.