miku: Use upstream gamemode

modules/programs/gamemode/default.nix

@@ -1,7 +1,21 @@
 { ... }:
 
 {
-  home-manager.users.alexander.xdg.configFile = {
-    "gamemode/gamemode.ini".source = ./gamemode.ini;
+  config.programs.gamemode = {
+    enable = true;
+    enableRenice = true;
+    settings = {
+      general = {
+        reaper_freq = 5;
+        desiredgov = "performance";
+        igpu_desiredgov = "powersave";
+        igpu_power_threshold = 0.3;
+
+        softrealtime = "on";
+        renice = 0;
+        ioprio = 0;
+        inhibit_screensaver = 1;
+      };
+    };
   };
 }