modules/nixos: rename config to shared

Signed-off-by: unexplrd <unexplrd@linerds.us>

hosts/sarien/configuration.nix

@@ -7,7 +7,7 @@
   imports = with inputs; [
     self.nixosModules.desktop
     self.nixosModules.system
-    self.nixosModules.config
+    self.nixosModules.shared
     ./disko
     ./hardware
     ./misc
@@ -23,7 +23,9 @@
   system.stateVersion = "25.11";
   time.timeZone = "Europe/Kyiv";
 
-  desktop.gnome.enable = true;
+  security.pam.sshAgentAuth.enable = true;
+
+  desktop.niri.enable = true;
   services.displayManager.autoLogin = {
     enable = true;
     user = "user";