Refactor back to a more modular configuration

hosts/t480/services.nix

@@ -0,0 +1,23 @@
+{
+  services = {
+    auto-cpufreq.enable = true;
+    gvfs.enable = true;
+    power-profiles-daemon.enable = false;
+    printing.enable = true;
+    pulseaudio.enable = false;
+    throttled.enable = true;
+    thermald.enable = true;
+    upower.enable = true;
+
+    xserver = {
+      enable = true;
+
+      displayManager.startx.enable = true;
+
+      xkb = {
+        layout = "gb";
+        variant = "";
+      };
+    };
+  };
+}