Cross Cluster Database Replication - adding GA docs

[yirensum]

In the PR, we add the GA docs of this feature.

We introduce:

1. Actual CREATE DATABASE DDL rather than the internal procedures we had before
2. Backup based pulling without network
3. External version of promote, i.e dbms.promoteReplicaDatabase

Note that some images here have been ai-generated - they give a sense of how the image should look like but are placeholders and need to be replaced with proper images.

Part of CLUSTER-1587

[neo4j-docops-agent]

This PR includes documentation updates
View the updated docs at https://neo4j-docs-operations-3107.surge.sh

Updated pages:

• Replicating databases across clusters