Add User Research banner to the GOV.UK homepage #1366

Job	Run time
Lint Ruby / Run RuboCop	18s
Lint JavaScript / Run Standardx	12s
Lint SCSS / Run Stylelint	14s
Run Pact tests / Verify pact tests	14s
Security Analysis / Run Brakeman	13s
Test JavaScript / Run Jasmine	43s
Test Ruby / Run Minitest	2m 35s
	4m 29s

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