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

[Bryan Housel]

@bhousel pushed 1 commit.

db40eee  Don't show banner unless content classed with overlay-sidebar


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1240/files/2ada0591b8d348459dc31f4279e27b21a773c061..db40eee333d81e6c02821f54b77d0ca63d6b3a1d
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