06_parallelism_perf_opt.ipynb about challenge problems only

[cpaniaguam]

In contrast to what the file name suggests, the notebook contains a number of challenge problems only.

@paulstey Was there such a notebook with a discussion about parallelism, profiling, and performance optimization? If so, I suppose I could use it for the second leg of the Julia session during the bootcamp.

https://github.com/brown-ccv/ccv-bootcamp-julia/blob/main/06_parallelism_perf_opt.ipynb