Update references from okp4/okp4d to axone-protocol/axoned

[coderabbitai]

As part of the rebranding effort, we need to update all references of the okp4/okp4d Docker image to axone-protocol/axoned and all okp4d command references to axoned. This includes updating the Docker image name and command references in the documentation and configuration files. This task is related to the migration of okp4d to the new axoned repository (axone-protocol/axoned#616). The changes will be part of another PR.