ESDB-147-8 - Move to Cloudsmith docker registry

[YoEight]

Changed: Updated CI workflows to pull eventstore docker images from cloud smith registry.
Changed: Updated README to reference Cloudsmith repository instead of ghcr.

[YoEight]

I don't think removing cloudsmith is the right move, considering we are going to add staging versions later

[josephcummings]

I don't think removing cloudsmith is the right move, considering we are going to add staging versions later

We are still going to pull the images from docker.eventstore.com/eventstore-ce/eventstoredb-ce - the recent updates were just to remove authentication steps from the CI workflows, since the Cloudsmith repository was recently made public to prevent OSS contributors from having to obtain credentials against the Cloudsmith registry.