docs(getting-started): $NODE_OPTIONS for ts

packages/docs/pages/getting-started.mdx

@@ -91,12 +91,12 @@ my-calculator
 └── test # contents are omitted for brevity
 ```
 
-
 <Callout>
   **Typescript Support** <br/>
   If you want to write the config in typescript, name it *`haetae.config.ts`*.
   Then install [`ts-node`](https://www.npmjs.com/package/ts-node),
   which is an optional `peerDependencies` of `haetae{:ts}` (from `@haetae/core{:ts}`).
+  Finally, provide an environment variable `NODE_OPTIONS='--loader=ts-node/esm'`.
 </Callout>
 
 <Callout>