garbage-collect now properly displays space freed up from clearing trash can, also optimises the nix store as well

modules/sys/sysenv/nix.nix

@@ -7,15 +7,9 @@
     system.stateVersion = "25.05";
     nix = {
       settings = {
-        auto-optimise-store = true;
         experimental-features = [ "nix-command" "flakes" ];
         substituters = [ "https://nix-gaming.cachix.org" ];
       };
-      gc = {
-        automatic = true;
-        dates = "weekly";
-        options = "--delete-older-than 7d";
-      };
     };
     time.timeZone = "America/New_York";
     i18n.defaultLocale = "en_US.UTF-8";