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

[Ian Dees]

@iandees pushed 1 commit.

429641b  Add banner-sotmus2017.png


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1640/files/a19a7f2baeb7662a33c948ee844756f3576cffa3..429641bd90c5a6bf1e3b9f5ca3784cca4015e01d
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