Update setup instructions for Python

[tobyhodges]

This updates the setup instructions for Python workshops. A recent blog post provides more context for this change. Specifically, this PR updates the instructions to reflect that we recommend Miniforge instead of Anaconda Python.

The previous setup instructions were fairly minimal, directing learners to install Anaconda and assuming that (with some experience working with Python) they will know how to do this. I guess a lot of learners may already have their own Python setup that they're happy with too. So I have not expanded the instructions to discuss the install steps in detail.

Please let me know if you think some more verbose guidance is needed and I can update.

[github-actions]

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⏱️ Updated at 2025-04-01 12:19:29 +0000

[tobyhodges]

Note that the environment.yml has been updated to remove the default channel and the gala dependency (so this is related to #237). I removed it before I saw that issue, since I got a message that the package was not available when I tried to install it. (Not sure why, since the package is listed as available on conda-forge?) But since you want to remove it anyway, I wonder if we can take the necessary steps (described by @abostroem in #237) here and close that issue when this PR gets merged?

[tobyhodges]

Also worth noting that, when this PR is ready to merge, I will need to release a new version of the example data on FigShare with the updated environment.yml.