feat(system): disable apparmor in hardened config

Caused some problems with passing secrets to miniflux that I could not
resolve. And there are very few apparmor profiles available anyway.

system/hardened.nix

@@ -13,6 +13,7 @@
   boot.kernelPackages = lib.mkOverride 900 pkgs.linuxPackages;
 
   security = {
+    apparmor.enable = lib.mkOverride 900 false;
     # Xbox Controller not working via Bluetooth if enabled
     lockKernelModules = lib.mkOverride 900 false;