📦 Created config files with common code

- Created common.nix for various configs
- Created theme.nix for theme related configs
- Moved some code to more logical files
- Moved some standalone files into nix multiline strings, in order to
  inject data

home-manager/hyprland/default.nix

@@ -6,6 +6,7 @@
     ./waybar
     ./hypridle
     ./hyprlock
+    ./hyprshot.nix
     ./settings.nix
     ./swaync
   ];