chore: remove unused option 'clanSchema' from core nixos modules

nixosModules/clanCore/default.nix

@@ -12,7 +12,6 @@
       ./nix-settings.nix
       ./options.nix
       ./outputs.nix
-      ./schema.nix
       ./sops.nix
       ./vars
     ]

nixosModules/clanCore/schema.nix

@@ -1,12 +0,0 @@
-{ options, lib, ... }:
-let
-  jsonschema = import ../../lib/jsonschema { inherit lib; } { };
-in
-{
-  options.clanSchema = lib.mkOption {
-    type = lib.types.attrs;
-    description = "The json schema for the .clan options namespace";
-    default = jsonschema.parseOptions options.clan { };
-    defaultText = lib.literalExpression "jsonschema.schemaToJSON options.clan";
-  };
-}