Add information to screenshots page

[Ein-Tim]

Description

This PR adds an informational disclaimer to the screenshots page, stating that it shows the screenshots prior to function reduction on May 1.

What was changed

• https://github.com/corona-warn-app/cwa-website/blob/master/src/data/screenshots.json
• https://github.com/corona-warn-app/cwa-website/blob/master/src/data/screenshots_de.json

Screenshots

English	German

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Fixes https://github.com/corona-warn-app/cwa-website/issues/3481

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Internal Tracking ID: EXPOSUREAPP-15163

[Ein-Tim]

The failing check is not my fault, right?

[MikeMcC399]

@Ein-Tim

The failing check is not my fault, right?

• No. It's not a problem with your PR. See https://github.com/corona-warn-app/cwa-website/issues/3479

[dsarkar]

@Ein-Tim @MikeMcC399 Thanks for the PR!