Separated, tabbed, hopefully done

I separated many of the parts of the nginx config into different files to help troubleshoot issues there.

I also tabbed all the settings to make them easier to read at a glance.

I added config files for phpMyAdmin, but I have yet to get it to work. I'm leaving them in for now.

I also created a separate subdomain config file for sites using a subdomain.

Signed-off-by: Chris Wilcoxson <chris@slushman.com>