docs(readme): add section for configuring css (#12616) #3214

Job	Run time
CI / Build	2m 54s
CI / Lint	2m 29s
Documentation / Build, test & deploy	6m 32s
Documentation / check-permissions / check	0s
CI / Unit tests	3m 34s
CI / Build demo app	2m 33s
CI / Integration tests (2)	3m 40s
CI / Integration tests (3)	4m 14s
CI / Integration tests (1)	3m 48s
CI / Integration tests (4)	4m 9s
CI / Integration tests (0)	3m 48s
Deploy release	4m 24s
	42m 5s

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