improve docker docs

[catdevnull]

for example, in https://github.com/tursodatabase/libsql/blob/main/docs/DOCKER.md?plain=1 the image url is outdated from the github.com/libsql era also, i can't find a :0.22 tag for example. and it's unclear what :latest is.

[eznix86]

True. It should be "ghcr.io/tursodatabase/libsql-server"