Remove unused configurations and packages from laptop setup

- Removed USBGuard configuration and its associated comments from configuration.nix.
- Cleaned up flake.nix by removing unnecessary overlays.
- Updated home.nix to remove references to Helium and Proton, and added Steam.
- Deleted secrets.default.nix and secrets.secrets.yaml files for security reasons.
- Removed Omen laptop specific configuration from omen.nix.
- Deleted vencord.nix as it is no longer needed.

hosts/laptop/home.nix

@@ -1,24 +1,21 @@
 {config, ...}: {
   imports = [
     # Programs
-    ../../home/programs/helium
-    ../../home/programs/proton
-    ../../home/programs/proton/auto-start-vpn.nix
     ../../home/programs/ghostty
     ../../home/programs/nvf
     ../../home/programs/shell
     ../../home/programs/git
     ../../home/programs/git/lazygit.nix
-    ../../home/programs/git/signing.nix # CHANGEME: Change the key or remove this file
     ../../home/programs/thunar
     ../../home/programs/nixy
     ../../home/programs/nightshift
     ../../home/programs/nix-utils
     ../../home/programs/spotatui
     ../../home/programs/yazi
+		../../home/programs/steam
+		#../../home/programs/zen
 
     ../../home/programs/group/basic-apps.nix
-    ../../home/programs/group/cybersecurity.nix
     ../../home/programs/group/dev.nix
     ../../home/programs/group/misc.nix