Fix "How to Learn Math" link

P1xt / p1xt-guides

Programming curricula

MIT License

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Closed stephenjfox closed 4 years ago

stephenjfox commented 4 years ago

Lagunita (source for the original link) is being shut down. This change adds an up-to-date link that stays within the Stanford domain.

This can be swapped for alternatives on other MOOC platform (e.g. edX) if Stanford loses its appeal