Set condarc and pin blas to mkl

[ericpre]

• [x] Set condarc with channel priority strict to be consistent with conda-forge guideline, see
  • https://conda-forge.org/docs/user/introduction.html#how-can-i-install-packages-from-conda-forge
  • https://conda-forge.org/docs/user/faq.html?highlight=channel_priority#faq-solver-speed
• [x] pin blas to mkl (libblas=*=*mkl), to make sure the mkl implementation is used. See https://conda-forge.org/docs/maintainer/knowledge_base.html#switching-blas-implementation

[francisco-dlp]

Could you update the description with what you are trying to achieve with these changes?

[ericpre]

I have updated the description and added link to the relevant documentation.