Render a subcommand for human-centric viewing

def render_subcommand(args):
    """Render a subcommand for human-centric viewing"""
    if args.subcommand == 'delete':
        return 'delete ' + args.delete_subcommand

    if args.subcommand in ('wal-prefetch', 'wal-push', 'wal-fetch'):
        return None

    return args.subcommand