feat(qtile): integrate xfce-power-manager

- incorporate the xfce power manager into the workflow, allowing for DE
  like power management in the system.
- also add bright(white) icons for brightness/volume controlls
- add the new apps in the README file
- i now think this WM is fature complete, no new tools may bright
  breaking changes. All the needed features have been integarted as
  needed. Only need to version the various packages themselves to
  prevent breaking changes in case they are upgraded

Author: mbugva

.config/dunst/icons/brightness-down.svg

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