Autoupdate homebrew and add simple config

nix/flake.nix

@@ -75,6 +75,8 @@
           "WireGuard" = 1451685025;
         };
         onActivation.cleanup = "zap";
+        onActivation.autoUpdate = true;
+        onActivation.upgrade = true;
       };
 
       # Auto upgrade nix package and the daemon service.
@@ -104,6 +106,12 @@
           done
         '';
 
+      system.defaults = {
+        dock.autohide = true;
+        trackpad.Clicking = true;
+        trackpad.TrackpadThreeFingerDrag = true;
+      };
+
       # Set Git commit hash for darwin-version.
       system.configurationRevision = self.rev or self.dirtyRev or null;