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feat(content): collate content files into subdirs

Fixes: #14

Filesystems generally see degraded performance from directories with too
many files in them. By nesting using the first two characters of the hash,
we should get a pretty good spread of directories without having too many files
in any single one.

Additionally, in order to prevent conflicts between different hashAlgorithms
being used in the same cache, this further collates content dirs under the
hashAlgorithm used for their digests.

BREAKING CHANGE:
Previously-generated content directories are no longer compatible
and must be regenerated.

9 of 9 new or added lines in 4 files covered. (100.0%)

373 of 398 relevant lines covered (93.72%)

32.04 hits per line