feat: update dep and archive warning

Author: julio4

pages/index.mdx

@@ -9,6 +9,11 @@ import { ThemeImage } from "../components/ThemeImage";
   />
 </div>
 
+:::danger
+_Starknet By Example_ was migrated to the official [Starknet Docs](https://docs.starknet.io).
+This is an archive version of the book and will not be updated. Be aware that the content might be outdated and not reflect the latest Starknet features.
+:::
+
 # Introduction
 
 Starknet By Example provides practical examples for building smart contracts on Starknet using the Cairo programming language.
@@ -38,6 +43,7 @@ Try out the examples instantly using the [Starknet Remix Plugin](https://remix.e
 ## Further reading
 
 To deepen your knowledge:
+
 - [Starknet Documentation](https://docs.starknet.io/) - The official Starknet documentation
 - [Cairo Book](https://book.cairo-lang.org) - Learn more about the Cairo programming language
 - [Awesome Starknet](https://github.com/keep-starknet-strange/awesome-starknet) - Curated list of Starknet resources