[CI, Docs] Update builder-worker post-release instructions
[CI, Docs] Update builder-worker post-release instructions

With https://github.com/habitat-sh/builder/pull/1309, we no longer
need to manually build new releases of `habitat/builder-worker`
following a successful Habitat release.

Signed-off-by: Christopher Maier <b4598f17a90ef80817bae8ad6c37249740caafb4@chef.io>

rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,rsertelon/habitat