clan config: re-enable clan config

pkgs/clan-cli/shell.nix

@@ -20,9 +20,6 @@ mkShell {
     pythonWithDeps
   ];
   # sets up an editable install and add enty points to $PATH
-  # This provides dummy options for testing clan config and prevents it from
-  # evaluating the flake .#
-  CLAN_OPTIONS_FILE = ./clan_cli/config/jsonschema/options.json;
   PYTHONPATH = "${pythonWithDeps}/${pythonWithDeps.sitePackages}";
   PYTHONBREAKPOINT = "ipdb.set_trace";