Modernize Numba lecture (#512)

* Modernize and improve Numba lecture

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix grammar ('which') and capitalize MATLAB

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Matt McKay <mmcky@users.noreply.github.com>

Author: 3 people