DEPR: remove 1.0 deprecations in 2.0 (`Styler`)
Removed deprecations from Styler:

- `where()`
- `hide_index`
- `hide_columns`
- `render`
- `set_na_rep`
- `set_precision`
-  `null_color` kwarg in `highlight_null`

can you add appropriate notes in the whatsnew Thanks @attack68 