chore: update Nix configurations for Nixcloud and common hosts

- Add Nixcloud host configurations including networking, hardware, and system settings
- Refactor existing configurations for clarity and organization
- Remove unused podman configuration from home-manager
- Update SSH agent settings and session variables in Nixbook host

hosts/Nixbook/default.nix

@@ -13,7 +13,9 @@
     kernelPackages = pkgs.linuxPackages_latest;
   };
 
-  environment.sessionVariables = { NIXOS_OZONE_WL = "1"; };
+  environment.sessionVariables = {
+    NIXOS_OZONE_WL = "1";
+  };
   environment.systemPackages = with pkgs; [
     exfat
     gcsfuse
@@ -30,7 +32,7 @@
   networking.hostName = "Nixbook";
   programs.hyprland.enable = false;
   programs.hyprland.withUWSM = false;
-
+  programs.ssh.startAgent = false;
   hardware = {
     sane.enable = true;
     graphics.enable = true;
@@ -88,7 +90,7 @@
       gdm.wayland = true;
       defaultSession = "gnome";
     };
-
+    gnome.gnome-keyring.enable = true;
     avahi = {
       enable = true;
       nssmdns4 = true;
@@ -154,9 +156,5 @@
     };
   };
 
-
-
-
-
   system.stateVersion = "23.11";
 }