Update README.md to focus more on Redstone

README.md

@@ -1,14 +1,16 @@
 
 <img src="tutorial/images/header.png">
 
-___Downstream is a fully onchain game platform and creation tool.___
+___Downstream is a fully onchain game platform and creation tool running on Redstone.___
 
 
-# Build your own game with Downstream
+# Build your own game on Downstream Redstone
 
-Follow the guide to [build your own game with Downstream](./tutorial/README.md).
+Downstream is deployed to Redstone, a mainnet L2 run by Lattice!
 
-# Build and run a local platform instance
+Follow the guide to [start building on mainnet](./tutorial/README.md).
+
+# Instructions for local development
 
 <h3>Get building on top of Downstream</h3>
 <details>