DOC: remove useless .md notebooks, move calibration notebook in its own directory, remove it from classification examples

doc/notebooks_calibration.rst

@@ -4,5 +4,5 @@ Calibration notebooks
 The following examples present advanced analyses on multi-class calibration.
 
 
-1. Top-label calibration for outputs of ML models : `notebook <https://github.com/scikit-learn-contrib/MAPIE/tree/master/notebooks/classification/top_label_calibration.ipynb>`_
+1. Top-label calibration for outputs of ML models : `notebook <https://github.com/scikit-learn-contrib/MAPIE/tree/master/notebooks/calibration/top_label_calibration.ipynb>`_
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doc/notebooks_classification.rst

@@ -1,13 +1,10 @@
 Classification notebooks
 ========================
 
-The following examples present advanced analyses on multi-class classification
-problems for computer vision settings that are too heavy to be included in the example
+The following example present an advanced analyse on multi-class classification
+problem for computer vision settings that is too heavy to be included in the example
 galleries.
 
 
 1. Estimating prediction sets on the Cifar10 dataset : `cifar_notebook <https://github.com/scikit-learn-contrib/MAPIE/tree/master/notebooks/classification/Cifar10.ipynb>`_
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-
-2. Top-label calibration for outputs of ML models : `top_label_notebook <https://github.com/scikit-learn-contrib/MAPIE/tree/master/notebooks/classification/top_label_calibration.ipynb>`_
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