More work on the docs

Started user guide, admin guide, man-page, etc.
Added clients options to sample configs
Removed system settings

This stuff should probably go in a separate "system" page for
administrators. Also fixed the layout to use the same copyright as the
code and license.
Removed --daemon option

It's rather pointless given the single-user nature of the application;
we expect to boot into the app and remain there until it shuts down (at
which point the host should shut down or reboot or whatever)