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

[Benoît]

thank you @bhousel for the detailed instructions @ https://github.com/openstreetmap/openstreetmap-website/pull/1580
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1587

-- Commit Summary --

  * add png file with background
  * add sotm2017 in banner.yml
  * remove old entries in banner.yml

-- File Changes --

    A app/assets/images/banners/banner-sotm-2017.png (0)
    M config/banners.yml (26)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1587.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1587.diff

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