Change the i3 config

Change the i3 config to support my new workflow with two screens.
A list of all changes:

 - Remove DHCP, VPN and storage indicators from i3bar

 - Show the same i3 bar on every display

 - Change the background to horizon-lights
Change colorscheme of i3 and urxvt

Change the colorscheme of i3 and urxvt to grey so it is easier on the eyes