[openstreetmap/openstreetmap-website] add banner for SotM 2017 (#1587)

[Benoît]

@althio pushed 1 commit.

eb1db9d  image with proper width 350px


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1587/files/5d97162d838f25d6f32d0ba4bd09018d1f72755a..eb1db9dcff03f8cf3f919c629b3b42206f0e7604
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