chore: deprecation warning

README.md

@@ -3,11 +3,15 @@
 [![Docs](https://img.shields.io/badge/docs-latest-brightgreen.svg)](https://docs.graphops.xyz/graphcast/radios/poi-radio)
 [![crates.io](https://img.shields.io/crates/v/poi-radio.svg)](https://crates.io/crates/poi-radio)
 
+## Deprecated
+
+POI Radio has been rebranded to [Subgraph Radio](https://github.com/graphops/subgraph-radio). Please see the [documentation](https://docs.graphops.xyz/graphcast/radios/subgraph-radio) for more information.
+
 ## Introduction
 
 The key requirement for an Indexer to earn indexing rewards is to submit a valid Proof of Indexing (POI) promptly. The importance of valid POIs causes many Indexers to alert each other on subgraph health in community discussions. To alleviate the Indexer workload, this Radio utilized Graphcast SDK to exchange and aggregate POI along with a list of Indexer on-chain identities that can be used to trace reputations. With the pubsub pattern, the Indexer can get notified as soon as other indexers (with majority of stake) publish a POI different from the local POI.
 
-[Documentation](https://docs.graphops.xyz/graphcast/radios/poi-radio) | [Packages](https://github.com/graphops/poi-radio/pkgs/container/poi-radio) | [Chat](https://discord.com/channels/438038660412342282/1087503343410225152) 
+[Documentation](https://docs.graphops.xyz/graphcast/radios/poi-radio) | [Packages](https://github.com/graphops/poi-radio/pkgs/container/poi-radio) | [Chat](https://discord.com/channels/438038660412342282/1087503343410225152)
 
 ## 🧪 Testing