Remove/rewrite Deploying from Dockerhub page

The tutorial has the page for how to deploy the whole GrimoireLab complex using a single Docker container: https://github.com/chaoss/grimoirelab-tutorial/blob/master/basics/dockerhub.md

The page links to the `grimoirelab/full` image which is over 4 years old, and some of the instructions around it also seem to be specific to the old version or otherwise out of date (is `credentials.cfg` still a thing?). Maybe the page needs a rewrite, or in the meanwhile just a removal, so that it doesn't mislead new comers to use a very old version?

EDIT: The same may apply to the [SirMordred in a container](https://chaoss.github.io/grimoirelab-tutorial/sirmordred/container/) page, which also references the old containers.