DOC: comprehensive example of `Styler.to_latex` features
can be backported as all features needed are now in 1.4.0

rendered:
![Screen Shot 2022-01-06 at 17 45 07](https://user-images.githubusercontent.com/24256554/148418704-8bad8197-7f07-457b-a73a-03c041a64c79.png)
![Screen Shot 2022-01-06 at 17 45 16](https://user-images.githubusercontent.com/24256554/148418715-7229b12f-eac3-4249-b3ad-48bdea026194.png)


wow crazy that you can now do this :-> thanks @attack68 