[openstreetmap/openstreetmap-website] Hide/show welcome banner with hidden attribute (PR #4111)

[Andy Allan]

Thanks! 

Yes, it's a complex play between hiding/showing based on screen size, and then effectively overriding that based on the cookie. The bootstrap use of `[hidden] { display: none !important; }` ([documentation](https://getbootstrap.com/docs/5.1/content/reboot/#html5-hidden-attribute)) is key here, if I understand it correctly.

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