Unify our `cargo rdme` handling #5125

Job	Run time
cargo clippy (ubuntu-latest)	4m 32s
cargo clippy (wasm32)	1m 43s
formatting	51s
cargo test (wasm32)	25s
cargo clippy (windows-latest)	6m 21s
cargo test (windows-latest)	4m 45s
cargo clippy (macos-latest)	3m 45s
cargo check (msrv) (macos-latest)	1m 12s
cargo test (macos-latest)	2m 11s
cargo check (msrv) (ubuntu-latest)	3m 20s
cargo test (ubuntu-latest)	6m 10s
cargo check (aarch64-android)	33s
cargo check (msrv) (windows-latest)	2m 42s
cargo doc	2m 18s
cargo check (msrv) (wasm32)	42s
typos	6s
cargo miri (unsafe tree_arena)	45s
	42m 21s

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