feat(book): Genesis - System Config #752

Job	Run time
test stable --no-default-features	1m 0s
test stable	53s
clippy	25s
test stable --all-features	1m 9s
doctest	42s
test nightly --no-default-features	30s
test nightly	51s
feature-checks	57s
no-std	29s
test nightly --all-features	1m 5s
test 1.81 --no-default-features	41s
wasm-unknown	34s
wasm-wasi	37s
test 1.81	41s
docs	25s
cfg-check	17s
feature-powerset	30m 49s
fmt	12s
	42m 17s

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