move steps to `WorkflowInvocationSteps` in a card; improve styling #891

Job	Run time
setup-selenium / setup_chromedriver	5s
build-client / build-client	11m 35s
Test (3.8, 0)	44m 17s
Test (3.8, 1)	54m 20s
Test (3.8, 2)	49m 14s
	2h 39m 31s

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