Fix: mlagents-learn: command not found

[nnilayy]

Fixes #586

This PR fixes the Python version incompatibility between Colab and the ML-Agents library, which caused installation to silently fail and commands like mlagents-learn to not be recognized. It provides a fix by setting up a compatible Python version using a venv managed with Miniconda.

• Added code to create, manage, and configure a venv using Miniconda in Colab for all related notebooks.
• Updated documentation in the notebooks and the corresponding units\en .mdx files to align with the changes.

@simoninithomas Gentle ping for review.
Let me know if any other changes are needed. Thanks! 🤗

[nnilayy]

@simoninithomas Gentle Bump For Review!!

[HuggingFaceDocBuilderDev]

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[simoninithomas]

Thank you for writing this part, but I think we can also add it to the notebook since most of students will directly jump in the notebook 🤔

[nnilayy]

Thanks for the feedback @simoninithomas 🤗! The PR already includes the Setup the Virtual Environment section right after the Clone The Repository section in the notebooks as well, and the same section has been added in the corresponding .mdx files like linked above.

https://github.com/nnilayy/deep-rl-class/blob/3961024a68721a68eccd90f978c649ee42116d62/notebooks/bonus-unit1/bonus-unit1.ipynb?short_path=93db85a#L180-L250

This is done for both the Bonus-Unit-1 and Unit-5 notebooks and their corresponding .mdx files

[simoninithomas]

Awesome thanks. It's ready to merge. Thanks for your work 🔥

[simoninithomas]

LGTM thanks for your work 🤗