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

[Holger Jeromin]

I am pretty sure osm.org should be usable with Internet Explorer < 9. 
Thats why i [suggested](https://github.com/openstreetmap/openstreetmap-website/issues/850#issuecomment-65446147) a compatible version.

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https://github.com/openstreetmap/openstreetmap-website/issues/850#issuecomment-139343904
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