Update README for Rococo Deployment (#1024)

* Update readme to Rococo

* Link to Canvas README for usage instructions

Co-authored-by: Hernando Castano <hernando@hcastano.com>

README.md

@@ -66,11 +66,14 @@ More relevant links:
 If you want to have a local setup you can use our [`substrate-contracts-node`](https://github.com/paritytech/substrate-contracts-node) for a quickstart.
 It's a simple Substrate blockchain which includes the Substrate module for smart contract functionality ‒ the `contracts` pallet (see [How it Works](#how-it-works) for more).
 
-The [Canvas UI](https://paritytech.github.io/canvas-ui/#/upload) can be used to deploy your contract to a chain and interact with it.
-
-We also have [a demonstration testnet](https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fcanvas-rpc.parity.io) running.
-You can request some tokens to play with from our [Faucet](https://riot.im/app/#/room/#canvas_faucet:matrix.parity.io) and deploy your contracts via the [Canvas UI](https://paritytech.github.io/canvas-ui/#/upload).
-
+We also have a live testnet on [Rococo](https://github.com/paritytech/cumulus/#rococo-crown)
+called [Canvas](https://github.com/paritytech/canvas/). Canvas is a Substrate based
+parachain which supports ink! smart contracts. For further instructions on testing with
+the Canvas deployment on Rococo, follow the instructions in the
+[Canvas README](https://github.com/paritytech/canvas#rococo-deployment).
+
+For both types of chains the [Canvas UI](https://paritytech.github.io/canvas-ui/#/upload)
+can be used to deploy your contract to a chain and interact with it.
 
 ## Usage