ci: enforce lowercase readme and tighten fast checks #70

Job	Run time
build-linux-host-simd	9m 25s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	3m 37s
build (aarch64-unknown-linux-gnu, ubuntu-latest)	4m 23s
build (x86_64-apple-darwin, macos-latest)	5m 12s
build (aarch64-apple-darwin, macos-latest)	3m 39s
release	11s
	26m 27s

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