🧰 Styled SDDM

- Catppuccin theme for SDDM
- Moved SDDM config to sddm.nix
- Removed unused toml file

sddm.nix

@@ -0,0 +1,21 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    (catppuccin-sddm.override {
+      flavor = "mocha";
+      font = "Noto Sans";
+      fontSize = "9";
+      background = "${./catppuccin.png}";
+      loginBackground = true;
+    })
+  ];
+
+  services.displayManager.sddm = {
+    enable = true;
+    theme = "catppuccin-mocha";
+    autoNumlock = true; # Enable numlock at login # TODO doesn't work
+    wayland.enable = true;
+    package = pkgs.kdePackages.sddm;
+  };
+}