[Website] Installation page refers to arrow-cpp from conda which has been deprecated in favor of libarrow

[raulcd]

On the install page: https://arrow.apache.org/install/
We refer to installing arrow-cpp with conda:

Install them with:

conda install arrow-cpp=16.1.* -c conda-forge
conda install pyarrow=16.1.* -c conda-forge
conda install r-arrow=16.1.* -c conda-forge

This has been deprecated. We should refer to libarrow and maybe to the different components like libarrow-all, libparquet, etc or at least pyarrow-core, pyarrow and pyarrow-all.

[raulcd]

This is the relevant file content:
https://github.com/apache/arrow-site/blob/main/install.md#c-and-python-conda-packages