[ci] make readme generation a just command #1394

Job	Run time
Build documentation (ubuntu-latest)	54s
Build and test core crates (ubuntu-latest, 1.78)	1m 39s
Lint	1m 6s
Build and test core crates (ubuntu-latest, stable)	1m 22s
Cross-compile to aarch64	1m 19s
Build and test core crates (macos-14, 1.78)	1m 25s
Build and test (all features) (ubuntu-latest, 1.78)	2m 40s
Build and test core crates (macos-14, stable)	1m 17s
cargo-compare extended tests (ubuntu-latest)	56s
Build and test (all features) (ubuntu-latest, stable)	2m 30s
Build and test core crates (windows-latest, 1.78)	5m 1s
cargo-compare extended tests (macos-14)	57s
Build and test (all features) (macos-14, 1.78)	2m 10s
Build and test core crates (windows-latest, stable)	3m 31s
Build and test (all features) (macos-14, stable)	2m 8s
Build and test (all features) (windows-latest, 1.78)	5m 58s
Build and test (all features) (windows-latest, stable)	7m 33s
	42m 26s

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