I have been working on moving my documentation projects from MediaWiki to regular WordPress pages. WordPress gives me a lot more formatting features that have made it easier to do things that make the documentation easier for you to work with. After all, I’m writing it for you.
Have a look at my updated pages and let me know if it’s helpful for you:
Freeside Installation for Debian 9
If there is a part of Freeside you are having trouble with please contact me and we can discuss options.