[Docs] Document how to do pivoting

[Floriferous]

TanStack Table version

v8.21.3

Framework/Library version

React 18

Describe the bug and the steps to reproduce it

By going through the repo, it seems like pivoting used to exist in previous versions (#1394 & #1237 for example), but if I search for "Pivot" in the tanstack table docs, nothing is returned, as if it didn't exist anymore or it is no longer supported?

Is there currently a built-in way to pivot data, or not? And if so, maybe one of the examples could be added to the docs?

Current situation is slightly confusing.

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

https://tanstack.com/table/latest/docs/introduction

Screenshots or Videos (Optional)

No response

Do you intend to try to help solve this bug with your own PR?

None

Terms & Code of Conduct

• [x] I agree to follow this project's Code of Conduct
• [x] I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.

[prasid444-niural]

I am not sure if pivoting is available internally due to the different complexity it can have based on generic data, but we have created additional implementation in the TanStack table to support pivoting based on our use cases. I can help with that if needed.