DOC-3215: Docs changes for new onboarding feature. #3726

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Task	Status
Restored the section explaining how to hide the Onboarding screen and button on the Premium upgrade promotion page.	Completed
Updated guidance for the "Finish setting up" screen, which now only appears when the URL explicitly includes `apiKey='no-api-key'`.	Completed
Clarified that for all other cases (e.g., missing, invalid, or mistyped API keys), the standard error messages will continue to be displayed as before.	Completed
A dedicated section for `'no-api-key'`, explaining what users should expect when using this placeholder.	Completed
Branch prefixed with `feature/<version>/`, `hotfix/<version>/`, `staging/<version>/`, or `release/<version>/`.	Completed
Documentation Team Lead has reviewed	Completed