[openstreetmap/openstreetmap-website] Add support for rotating banners, add banners for SOTM, SOTMUS (#1240)

[Bryan Housel]

> I'm not sure what we've done in previous years, but I suspect the ad has vanished while the sidebar is in use, as I think the welcome message does if you haven't cancelled it?

Good catch, just pushed db40eee which makes the `banner` div work like the `welcome` div.  Now the banner is only visible when the sidebar isn't being used for anything else.


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