Move Relay Specification from open-rpc playground to hedere-docs

[quiet-node]

Problem

Currently, the Relay specification document is hosted on the OpenRPC Playground. It would be better and easier to maintain if the specification could be migrated from the OpenRPC Playground to our documentation page. The SDK APIs and mirror-node APIs are already available on the documentation page. Moving the Relay specification to the same page would provide users with a unified and well-structured resource.

Solution

Migrate Relay spec from open-rpc playground to hedera-docs page

Alternatives

No response