i3status: cleanup configuration file

 * remove unnecessary (commented out) code
 * rearrange modules
 * remove extra characters for ethernet and wireless modules
 * use time module instead of tztime
i3status: change colours
i3status: add load module
i3status: add cpu_temperature module
i3: revert "change position of the status bar"

Move status bar back to the top.
This reverts commit bbc4aa8a3628ef667668fda9afb40416743b6ed3.
i3: cleanup configuration file
i3: add colour configuration for i3 and i3bar
i3: change lock and logout keybindings