limit garbage collection and boot configurations

nixos/common/global/nix.nix

@@ -9,7 +9,7 @@
       # Automatically run the garbage collector an a specified time.
       automatic = true;
       dates = "weekly";
-      options = "--delete-older-than 30d";
+      options = "--delete-older-than 14d";
     };
 
     # This will add each flake input as a registry

nixos/fuchsia/hardware-configuration.nix

@@ -35,7 +35,10 @@
         efiSysMountPoint = "/boot";
         canTouchEfiVariables = true;
       };
-      systemd-boot.enable = true;
+      systemd-boot = {
+        enable = true;
+        configurationLimit = 3;
+      };
     };
   };