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

[Bryan Housel]

@bhousel pushed 1 commit.

e14ec15  Refactor banner logic into BannerHelper module


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https://github.com/openstreetmap/openstreetmap-website/pull/1240/files/933335a0ea28f274bc7301c18611bcd90709fd99..e14ec1547e108116a57c910c938873e4155f6e9a
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