Rust

Use CSS class `markdown-alert` instead of `alert` #1199

Job	Run time
clippy_format	2m 21s
build_lib_test (nightly)	48s
build_wasm (nightly)	46s
build_lib_test (beta)	1m 2s
build_bin_spec (nightly)	1m 3s
build_wasm (beta)	47s
build_lib_test (stable)	1m 3s
lockfile	56s
build_wasm (stable)	42s
build_bin_spec (beta)	1m 2s
build_lib_test ($MSRV)	3m 1s
build_wasm ($MSRV)	2m 31s
build_bin_spec (stable)	1m 2s
build_bin_spec ($MSRV)	1m 17s
no_features_build_test (nightly)	25s
no_features_build_test (beta)	25s
no_features_build_test (stable)	23s
no_features_build_test ($MSRV)	2m 13s
	21m 47s

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