fix(dx): make it really clear when OCHA Services is overridden

[rupl]

I am intentionally leaving the cd-header embed here for the sake of the ticket. See the other PR in CD: UN-OCHA/common_design#463

Refs: CD-537

@left23 review request is FYI only

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Pusher: @rupl, Action: pull_request, Workflow: Run tests