update nixos configs

- bin/screens: line to fix touchscreen rotation
- add zathura config file (zathurarc)
- nixos:
  - rearrange config files reusing most of configs in common-configuration.nix
  - add chuwi-configuration.nix

bin/timeatlock

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+current_time=$(date +"%H:%M")
+battery_level=$(cat "/sys/class/power_supply/BAT0/capacity")
+
+echo "timeatlock $current_time h, Battery level: $battery_level %"