Update Core Theory links from Coursera to edx and textbook website #1367
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Coursera has recently removed audit access from it's course catalog.
Luckily, the core theory courses is also available on edx, which retains an audit option.
In addition, I've included the textbook website which links to freely available lectures, slides, forums, and an automated test suite for programming exercises.
The main difference in material is that there are additional theory problems on edx that do not appear on the textbook website.