lint(track_config): check hello-world `status` (#436)
lint(track_config): check hello-world `status` (#436)

With this commit, `configlet lint` now checks that a track-level
`config.json` file follows the below rule:

- The `exercises.practice[].status` value must, if
  `exercises.practice[].slug` is equal to `hello-world`, be either 
  omitted or the string `active`

Co-authored-by: ee7 <6cd0bf6d6fb42eedb0ac66182c815fd97fb4f715@users.noreply.github.com>

exercism/configlet