[openstreetmap/openstreetmap-website] Don't show SotM banner on mobile/small screens (#1247)

[nemobis]

I keep seeing this banner (in various form) on a mobile browser, not nice;

![screenshot_2016-06-30-00-37-44](https://cloud.githubusercontent.com/assets/901528/16471197/6c9a3808-3e5b-11e6-8d0f-6da91093cac0.png)


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