📦 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

modules/sddm.nix

@@ -1,10 +1,13 @@
 { pkgs, ... }:
-
+let
+  theme = import ../theme.nix;
+  flavor = theme.flavor;
+in
 {
   environment.systemPackages = with pkgs; [
     (catppuccin-sddm.override {
-      flavor = "mocha";
-      font = "Noto Sans";
+      flavor = flavor;
+      font = "JetBrainsMono";
       fontSize = "9";
       background = "${../catppuccin_high.png}";
       loginBackground = true;
@@ -13,7 +16,7 @@
 
   services.displayManager.sddm = {
     enable = true;
-    theme = "catppuccin-mocha";
+    theme = "catppuccin-${flavor}";
     autoNumlock = true; # Enable numlock at login # TODO doesn't work
     wayland.enable = true;
     package = pkgs.kdePackages.sddm;