I tried one more time to use the wiki of github, with the aim to think about how to do a wiki for Nethserver.
My conclusion is final, it is impossible !!!!!!
I cannot use category, it is a basic feature for a wiki, tag a page with a specific category, after you create a page which retrieves all categories. That can be done by hand, do a page and add the url in another page.....but it is boring. this what I mean -> http://wiki.contribs.org/Category:Howto
I cannot create parent page, all pages are following the same order. this what I mean -> http://wiki.contribs.org/Raid:Growing and http://wiki.contribs.org/Raid
and probably much more 
this are basic features without this you cannot create a wiki for project....for a software why not , but never for a project.
When your wiki grows, it is quite impossible to manage it, Did I miss these basic features ?????
What is the Plan B ?