Update README.md

Author: alex-connolly

README.md

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-    <a  href="https://docs.x.immutable.com/docs">
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+Immutable X has been superseded by [Immutable Chain](https://explorer.immutable.com). 
 
----
-
-# Immutable X Examples
-
-## Introduction
-
-This repository contains example scripts for interacting with Immutable X APIs. 
-
-## Guides
-
-This repository is intended to be used alongside the Immutable X [NFT minting tutorial](https://docs.immutable.com/docs/x/zero-to-hero-nft-minting).
-
-## Docs
-
-* [Onboarding (Self Service)](docs/onboarding.md) 
-* [Public Interfaces](docs/public-interfaces.md)
-
-## License
-
-Immutable Examples repository is distributed under the terms of the [Apache License (Version 2.0)](LICENSE).
-
-## Contributing
-
-Please check [contributing guidelines](CONTRIBUTING.md) to learn how to help this project.
+If you're building apps with Immutable, please use [Immutable's Unified SDK](https://github.com/immutable/ts-immutable-sdk).