docs: fix links

Author: mikemaccana

README.md

@@ -7,14 +7,12 @@ and/or node.js, made by the Solana Foundation's
 [Unboxed Software](https://beunboxed.com/), and [StarAtlas](https://staratlas.com/).
 
 > [!IMPORTANT]  
-> `@solana-developers/helpers` is for Solana web3.js version 1. The updated version of this package
-> which is compatible with Solana web3.js version 2 is called `gill`. Learn more here:
+> `@solana/helpers` is for Solana web3.js version 1, which is now deprecated. web3.js version 2 is
+> now known as [**Solana Kit**](https://solanakit.com)
 >
-> - npm registry - https://www.npmjs.com/package/gill
-> - source repository - https://github.com/solana-foundation/gill
-
-> [!IMPORTANT]  
-> `@solana/helpers` is for Solana web3.js version 1. An updated version of `@solana/helpers` for Solana web3.js version 2 is at https://github.com/helius-labs/kite.
+> The updated version of `@solana/helpers` for Solana Kit is [Kite](https://solanakite.org).
+>
+> Alternative high-level tools for Solana Kit include [Gill](https://www.gillsdk.com/).
 
 ## What can I do with this module?