Installing multiqc with Rosetta running

[lukenoaa]

If user is running Rosetta (to enable QIIME 2 to run on Apple Silicon Macs), the instructions to install multiqc conda environment will not work. User first needs to create the environment, then run conda config --env --set subdir osx-64, then install the desired packages, which will be the X86 versions. See https://stackoverflow.com/questions/71691598/how-to-run-python-as-x86-with-rosetta2-on-arm-macos-machine.

May want to update the wiki to reflect this.