Refactor theme module

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/gui/btop/default.nix

@@ -12,23 +12,20 @@ let
 in
 {
   home-manager.users.${username} = {
-    programs = {
-      btop.settings.color_theme = "matugen";
+    programs.btop.settings.color_theme = "matugen";
 
-      matugen.settings.templates.btop = {
-        input_path = ./theme.theme;
-        output_path = "${hmConfig.xdg.configHome}/btop/themes/matugen.theme";
-      };
+    theme = {
+      templates."${hmConfig.xdg.configHome}/btop/themes/matugen.theme".source = ./theme.theme;
+
+      extraConfig = "${
+        lib.meta.getExe (
+          pkgs.writeShellApplication {
+            name = "reload-btop";
+            runtimeInputs = with pkgs; [ procps ];
+            text = "exec pkill btop -SIGUSR2";
+          }
+        )
+      } &";
     };
-
-    theme.extraConfig = "${
-      lib.meta.getExe (
-        pkgs.writeShellApplication {
-          name = "reload-btop";
-          runtimeInputs = with pkgs; [ procps ];
-          text = "exec pkill btop -SIGUSR2";
-        }
-      )
-    } &";
   };
 }