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docs: rewrite the README in a tighter voice #63

Job	Run time
Package (publish dry run)	52s
Unit Tests (ubuntu-latest)	56s
pre-commit	1m 5s
Unit Tests (windows-latest)	2m 49s
loom	37s
Miri (undefined behaviour + leaks)	13m 27s
Fuzz (ASAN smoke)	2m 18s
Finished Build and Test	2s
	22m 6s