docs: Document how to check on a running dokku-installer
docs: Document how to check on a running dokku-installer

Closes #2559
[ci skip]
progrium/dokku,jimjag/dokku,jimjag/dokku,jimjag/dokku,jimjag/dokku,progrium/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,claytonbrown/dokku,alexquick/dokku,progrium/dokku,alexquick/dokku,alexquick/dokku,jimjag/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku,alexquick/dokku,jimjag/dokku,dokku/dokku,progrium/dokku,alexquick/dokku,dokku/dokku,claytonbrown/dokku,alexquick/dokku,jimjag/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,alexquick/dokku