Refactor mangohud config.

nodes/hosts/common/programs/steam.nix

@@ -24,10 +24,18 @@
         enable = true;
       };
     };
+
+    mangohud = {
+      enable = true;
+      settings = {
+        position = "top-right";
+        cpu_stats = true;
+        gpu_stats = true;
+        fps = true;
+        font_size = 12;
+        cellpadding_y = -0.070;
+      };
+    };
   };
-  
-  environment.systemPackages = [
-    pkgs.mangohud
-  ];
 }