[openstreetmap/openstreetmap-website] Add SOTM US banner and remove SOTM.org banner (#1640)

[Ian Dees]

@iandees pushed 1 commit.

a19a7f2  Delete banner-sotm-2017.png


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1640/files/2e34dd715e75bf919535d9c215f26a8843bab27c..a19a7f2baeb7662a33c948ee844756f3576cffa3
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