Ada good first issues

The `alr index --del 1` command fails with a misleading error message because it expects an index name, not an index number. The issue suggests that the error message should be updated to accurately reflect that an index name is required.

The `alr index --name asdf` command currently lists existing indexes instead of throwing an error as expected. This is because the `--name` flag is intended to be used with `--add`, and the validation for its standalone use is missing.