Quality of life changes

[Aramist]

This PR makes changes which add to the User experience, but don't substantially change the educational content of the tutorials:

Features:

• Adds syntax and error highlighting
• Adds multi-line input for coding with block statements
• Adds a command history (accessible via up/down arrow keys)
• Adds a shift+enter shortcut for evaluating code
• Automatically scrolls the output DOM element to show new python output / errors
• Fixes a bug in which python standard output was not directed to the output DOM element

Caveats:

• Still uses old version of Pynapple (numba dependency is incompatible with Pyodide)
• Does not introduce a way to verify lesson completion or allow different lessons to have different setup scripts
• Only tested on my machine
• Introduces a new dependency (highlight.js min + python)