Stop using alternate package indexes or channels since the release to the official ones

As khiops-python library is released to PyPI and conda-forge, promote these official sources and use them

Author: Thierry RAMORASOAVINA

README.md

@@ -13,8 +13,16 @@ in two ways:
 
 ## Installation
 
+Using `conda`
 ```bash
-conda install -c conda-forge -c khiops khiops
+conda install khiops
+```
+
+Using `pip`
+```shell
+python -m venv khiops-venv
+. khiops-venv/bin/activate
+pip install khiops
 ```
 Other install methods are documented at the [Khiops website][khiops-install].
 

doc/index.rst

@@ -10,7 +10,15 @@ Khiops is better installed with `conda package manager <https://docs.conda.io/en
 
 .. code-block:: shell
 
-    conda install -c conda-forge -c khiops khiops
+    conda install khiops
+
+Alternatively, you can install in a virtual environment using `pip`
+
+.. code-block:: shell
+
+    python -m venv khiops-venv
+    . khiops-venv/bin/activate
+    pip install khiops
 
 More details and other install methods are documented at the `Khiops website
 <https://www.khiops.org/setup>`_.

packaging/docker/khiopspydev/Dockerfile.ubuntu

@@ -67,7 +67,7 @@ RUN true \
         # khiops core \
         $CONDA install -y -n py${version}_conda ${RC_LABEL}khiops-core=$(echo ${KHIOPS_REVISION} | tr -d "-") ; \
         # remote files drivers installed in the conda environment \
-        $CONDA install -y -n py${version}_conda -c khiops \
+        $CONDA install -y -n py${version}_conda \
         khiops-driver-s3=${KHIOPS_S3_DRIVER_REVISION} \
         khiops-driver-gcs=${KHIOPS_GCS_DRIVER_REVISION}; \
     done' \