[DOC ISSUE] - Add a Next.js Example to KaibanJS Documentation

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Describe the Issue

Currently, the documentation provides a tutorial for integrating KaibanJS with React using Vite. However, many developers use Next.js to build their applications, and it would be helpful to have a clear example or guide for setting up and integrating KaibanJS with Next.js.

This example could follow a structure similar to the existing React tutorial, covering the project setup, installation of dependencies, defining agents, and handling tasks within a Next.js application.

Including a Next.js-specific example would make the documentation more comprehensive and accessible to developers who use that framework.

Doc URL

This suggestion is related to the section "React + AI Agents (Tutorial)" in the documentation: https://docs.kaibanjs.com/react-tutorial. And the idea is to do something similar but with Next.js + AI Agents (Tutorial), which does not exist in the documentation.