Try looking under /var/www - but it's owned by root, so you'll need to type

sudo chown user:user /var/www

in a terminal, replacing 'user' with your username and entering your
logon password when prompted.

I found the directory but notice redirects to other locations for the
media wiki files. My next question is how do I put the files in my
user directory and make a redirect from the /var/www directory?

Maybe a better question is, what is a redirect called in linux so I
can talk about this without an interpreter? or maybe find answers
without bothering forum members with questions I should be answering
by digging.

A "redirect" in Linux/UNIX is called a link. In your case a "soft"
link. Read up on links. You can put your web DocumentRoot in
/var/www/whatever where whatever is a link to where the docs really are.
You can also change the apache2 configuration files (in /etc/apache2
to point to wherever you want it to. I use /web since my files are on a
separate drive.