[openstreetmap-website] retina compatible icons (#850)

[Holger Jeromin]

could we close this or should we wait for 
https://github.com/openstreetmap/openstreetmap-website/blob/master/app/assets/images/directions.png

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https://github.com/openstreetmap/openstreetmap-website/issues/850#issuecomment-140081579
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