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

[Bryan Housel]

@bhousel pushed 1 commit.

40abfdd  remove debug statement

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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1240/files/5e27978d3cd55b267f0222d51d9e8efa26e389e9..40abfdd316be98b56a95afc4d12fbf42b29ff982
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