Stop publishing (releases) to Dockerhub

[Dav1dde]

• Double check self hosted no longer depends on docker hub
• Remove dockerhub from craft
• Remove dockerhub from all CI actions
• Update the docs to pull from ghcr instead

[linear]

RELAY-133 Stop publishing (releases) to Dockerhub

[olksdr]

Let's check the usage of the docker hub and decide if we need to keep publishing or deprecate that .