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

[Bryan Housel]

@bhousel pushed 1 commit.

3e82a36  Add end dates to banners


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1240/files/e14ec1547e108116a57c910c938873e4155f6e9a..3e82a36743f1be6eda2098e9e050dd0c5edcda55
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