Remove outdated contract docs (#4774)

packages/api-contract/README.md

@@ -1,16 +1,3 @@
 # @polkadot/api-contract
 
 Interfaces to allow for the encoding and decoding of Substrate contract ABIs.
-
-```js
-import {ApiPromise, WsProvider } from '@polkadot/api';
-import { Abi } from '@polkadot/api-contract';
-
-const wsProvider = new WsProvider(<...Node Url...>);
-const api = await ApiPromise.create({ provider: wsProvider });
-const abi = new Abi(<...JSON ABI...>, api.registry.getChainProperties());
-
-api.tx.contracts
-  .call(<contract addr>, <value>, <max gas>, abi.messages.<method name>(<...params...>))
-  .signAndSend(<keyring pair>, (result: SubmittableResult) => { ... });
-```