message: fix(cli): Clarify role of --destination
  Making it clear that it is for the generated-site's output and not any
  other sub-command (like `cobalt new`).  Really, it shouldn't exist for
  those.
diff: @@ -19,7 +19,7 @@ pub fn get_config_args() -> Vec<clap::Arg<'static, 'static>> {
  .short("d")
  .long("destination")
  .value_name("DIR")
  - .help("Destination folder [default: ./]")
  + .help("Site destination folder [default: ./]")
  .takes_value(true),
  clap::Arg::with_name("drafts")
  .long("drafts")
  