fix: add deprecation notices

README.md

@@ -1,3 +1,9 @@
+> # ⛔️ DEPRECATED: [js-IPFS](https://github.com/ipfs/js-ipfs) has been superseded by [Helia](https://github.com/ipfs/helia)
+>
+> 📚 [Learn more about this deprecation](https://github.com/ipfs/js-ipfs/issues/4336) or [how to migrate](https://github.com/ipfs/helia/wiki/Migrating-from-js-IPFS)
+>
+> ⚠️ If you continue using this repo, please note that security fixes will not be provided
+
 <p align="center">
   <a href="https://js.ipfs.io" title="JS IPFS">
     <img src="https://ipfs.io/ipfs/Qme6KJdKcp85TYbLxuLV7oQzMiLremD7HMoXLZEmgo6Rnh/js-ipfs-sticker.png" alt="IPFS in JavaScript logo" width="244" />