Redirect to dask-worker cli documentation (#4247)
Redirect to dask-worker cli documentation (#4247)

The doc on the `dask-worker` cli was not up-to-date on `distributed`
docs. It's kept up-to-date automatically on the main `dask` docs, so
this commit makes the `distributed` docs redirect to the main `dask`
docs for the `dask-worker` cli section.
dask/distributed,dask/distributed,dask/distributed,dask/distributed