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

[Benoît]

@althio pushed 1 commit.

1d49b0d  Delete sotmlatam-2016.jpg


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1587/files/18fb0f8461343a4d96553405b1768522fca97943..1d49b0d71df85ca7f6d049c2ccd2bed0999f2a79
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