Move auto-cpufreq/firewall for wireguard to modules.

modules/nixos/auto-cpufreq.nix

@@ -0,0 +1,28 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  options = {
+    crony.auto-cpufreq.enable = lib.mkEnableOption "Enable auto-cpufreq and set it up for my laptop.";
+  };
+
+  config = lib.mkIf config.crony.auto-cpufreq.enable {
+    # Setup auto-cpufreq
+    programs.auto-cpufreq = {
+      enable = true;
+
+      settings = {
+        battery = {
+          governor = "powersave";
+          turbo = "never";
+        };
+
+        charger = {
+          governor = "performance";
+          turbo = "auto";
+        };
+      };
+    };
+  };
+}