text: Title: Mention other, preferred, packages in docs
  Body: [`QuantileRegressor`](https://scikit-learn.org/stable/modules/generated/sklearn.linear_model.QuantileRegressor.html#sklearn.linear_model.QuantileRegressor) made it into scikit-learn some time ago already.
  
  As in the future other features could lose the _experimental status_ and be incorporated as well (I am looking at you [`TunedThresholdClassifier`](https://github.com/scikit-learn/scikit-learn/pull/26120)) should we plan to deprecate them in future versions of scikit-lego?