Adding Stellar to Quick-Start (#930)

update

Author: idalithb

website/src/pages/en/substreams/quick-start.mdx

@@ -31,6 +31,7 @@ If you can't find a Substreams package that meets your specific needs, you can d
 - [Starknet](https://docs.substreams.dev/tutorials/intro-to-tutorials/starknet)
 - [Injective](https://docs.substreams.dev/tutorials/intro-to-tutorials/on-cosmos/injective)
 - [MANTRA](https://docs.substreams.dev/tutorials/intro-to-tutorials/on-cosmos/mantra)
+- [Stellar](https://docs.substreams.dev/tutorials/intro-to-tutorials/stellar)
 
 To build and optimize your Substreams from zero, use the minimal path within the [Dev Container](/substreams/developing/dev-container/).