Remove some extra junk

lib/fudo/hosts.nix

@@ -131,6 +131,12 @@ let
         description = "Keytab from which to create a keytab secret.";
         default = null;
       };
+
+      keep-cool = mkOption {
+        type = bool;
+        description = "A host that tends to overheat. Try to keep it cooler.";
+        default = false;
+      };
     };
   };