Link to additional learning resources

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Each Ivy lesson should have a healthy list of links to additional learning resources.

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Python resources:

• There are some good examples in this Stack Overflow blog post
• Codecademy: Learn Python 3 (suggested by @avanblunk)

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Shell resources:

• A zork-esque intro to the terminal from MIT (suggested by @erexer)
• Include a bash cheat sheet (suggested by @iovereem)

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General resources:

• "missing" CS lectures (suggested by @erexer)

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JupyterLab and Notebook keyboard shortcuts:

• https://gist.github.com/discdiver/9e00618756d120a8c9fa344ac1c375ac
• https://blog.ja-ke.tech/2019/01/20/jupyterlab-shortcuts.html

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@gregtucker suggested this Geo Python site: https://geo-python-site.readthedocs.io/en/latest/index.html