Remove IBC from the SDK (#8735)

Author: colin-axner

README.md

@@ -63,6 +63,10 @@ For more, please go to the [Cosmos SDK Docs](./docs/).
 
 The Cosmos Hub application, `gaia`, has moved to its [own repository](https://github.com/cosmos/gaia). Go there to join the Cosmos Hub mainnet and more.
 
+## Interblockchain Communication (IBC)
+
+The IBC module for the SDK has moved to its [own repository](https://github.com/cosmos/ibc-go). Go there to build and integrate with the IBC module. 
+
 ## Starport
 
 If you are starting a new app or a new module you can use [Starport](https://github.com/tendermint/starport) to help you get started and speed up development. If you have any questions or find a bug, feel free to open an issue in the repo.

docs/core/proto-docs.md

@@ -14,5 +14,7 @@ This repository contains reference documentation for the IBC protocol integratio
 4. [Relayer](./relayer.md)
 5. [Governance Proposals](./proposals.md)
 
+**NOTE**: The IBC module has been moved to its [own repository](https://github.com/cosmos/ibc-go).
+
 After reading about IBC, head on to the [Building Modules
 documentation](../building-modules/README.md) to learn more about the process of building modules.