[docs] Nested menu demo

[prakhargupta1]

Related page

https://mui.com/material-ui/react-menu/

Issue description

Prepared a nested menu demo to reply to a user. Maybe we can add this to the docs? If it makes sense, I can submit a PR.

Context

The user asked if there is a way to implement nested menu out of the box.

Search keywords: menu

[DiegoAndai]

Hey @prakhargupta1, I think that would be useful. Please assign @mapache-salvaje for review if you open the PR.

[prakhargupta1]

Hey @prakhargupta1, I think that would be useful. Please assign @mapache-salvaje for review if you open the PR.

I haven’t had a chance to work on this yet. However, another user raised the topic today and commented that they had to build a custom implementation and an official component would have been really helpful. I also came across a similar request from a user on a Reddit thread.