sddm: use catppuccin-sddm instead

nixos.nix

@@ -255,7 +255,8 @@ in
   services.displayManager.sddm = {
     enable = true;
     wayland.enable = true;
-    theme = "${import ./theming/sddm { inherit pkgs; }}";
+    theme = "catppuccin-frappe";
+    package = pkgs.kdePackages.sddm;
   };
 
   # Enable Hyprland
@@ -396,6 +397,15 @@ in
     wl-clipboard
     xclip
     zoxide
+    (catppuccin-sddm.override # So SDDM finds the theme files.
+      {
+        flavor = "frappe";
+        font = "FantasqueSansM Nerd Font";
+        fontSize = "12";
+        background = "${./theming/sddm/Background.jpg}";
+        loginBackground = true;
+      }
+    )
 
     # Networking
     gping

theming/sddm/default.nix

@@ -1,21 +0,0 @@
-{ pkgs }:
-
-let
-  image = ./Background.jpg;
-in
-pkgs.stdenv.mkDerivation {
-  name = "sddm-theme";
-  src = pkgs.fetchFromGitHub {
-    owner = "MarianArlt";
-    repo = "sddm-sugar-dark";
-    rev = "ceb2c455663429be03ba62d9f898c571650ef7fe";
-    sha256 = "0153z1kylbhc9d12nxy9vpn0spxgrhgy36wy37pk6ysq7akaqlvy";
-  };
-  installPhase = ''
-    mkdir -p $out
-    cp -R ./* $out/
-    cd $out/
-    rm Background.jpg
-    cp -r ${image} $out/Background.jpg
-  '';
-}