📦 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/hypridle/default.nix

@@ -1,4 +1,3 @@
-{ ... }:
 let
   # Time in seconds
   lockAfter = 1200;