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Move most of SETUP.md to getting started with C++ page
nucleotide-count: Remove special treatment of uracil

For the related discussion see https://github.com/exercism/xpython/pull/98.
Merge pull request #10 from sjakobi/adjust-nucleotide-count

nucleotide-count: Remove special treatment of uracil
Merge pull request #11 from LegalizeAdulthood/go-live

Go live