Update README.md

Note on radix sort videos.

Added Sedgewick Radix sorting videos.

Reorganized sorting section. Moved some lectures to additional section.

Moved some string searching resources into additional detail section.

Added Sedgewick videos to final review.

Moved A&P down.

Additional note on A&P.

Removed "Algorithms and Programming: Problems and Solutions"

Added a few more book resources.

My notes on Skiena's book.

Added k-D trees, suffix arrays.

Added HyperLogLog, Locality-Sensitive Hashing, and a video for linear programming.

Added a new explainer for Fourier Transform.

Found a better video for Knuth-Morris-Pratt.