fix[deploy]: ton -> ton-core (#7)

`ton` package throws an error

pages/start/deploy.mdx

@@ -7,10 +7,10 @@ Template project provides a handy way to deploy contracts, but you can do it you
 To deploy a smart contract in TON you need to send a message with `init` data attached to it. The easiest way to get an `init` for your contract is using a generated typescript bindings that would help to call an init function.
 
 ```typescript
-import base64url from "base64url";
-import qs from "qs";
-import { Address, beginCell, storeStateInit } from "ton";
-import { Counter } from "./output/sample_Counter";
+import base64url from 'base64url';
+import qs from 'qs';
+import { Address, beginCell, storeStateInit, contractAddress, toNano } from 'ton-core';
+import { Counter } from './output/sample_Counter';
 
 // Forming an init package
 let owner = Address.parse("some-address");