fix:Update <Inbox /> Headless Tab Docs for @novu/js SDK Initialization

[Anishpras]

🛠 Fix: Updated Novu SDK Initialization Example

The previous documentation used a deprecated method for initializing the Novu SDK via @novu/js. This update corrects the code snippet and clarifies the recommended usage for developers using the Headless <Inbox /> component.

🚨 Problem

The documentation previously showed:

import { Novu } from "@novu/js";

const novu = new Novu({
  apiKey: 'YOUR_API_KEY',
});

However, this is no longer valid in the latest versions of the SDK, as the apiKey parameter is not recognized or used.

Solution:

import { Novu } from "@novu/js";

```ts title="Initialize Novu SDK (Correct Usage)"
export const novu = new Novu({
  applicationIdentifier: 'YOUR_APPLICATION_IDENTIFIER',
  subscriberId: 'YOUR_SUBSCRIBER_ID',
});

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[Anishpras]

@scopsy Done ✅