Simplify `anaconda copy` with dependencies

[Jeremy Howard]

For each python version:

conda create -yn tmp python==3.9
conda activate tmp
conda install -c defaults -c conda-forge -d sentencepiece transformers rich mamba timm --json > inst.json

Then copy the conda-forge ones over to fastai channel.

[Hamel Husain]

Putting my notes here

Removing environments

conda remove --name tmp -y --all