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

[Holger Jeromin]

The sprite thing could perhaps be solved with this additional code 

    @media
    -webkit-min-device-pixel-ratio: 2,
       min--moz-device-pixel-ratio: 2,
         -o-min-device-pixel-ratio: 2/1,
            min-device-pixel-ratio: 2,
                    min-resolution: 150dpi,
                    min-resolution: 2dppx{
      .icon {
        background:transparent image-url("sprite.svg") no-repeat 0 0;
      }
    }

And hope that the browsers announcing this properties are able to render svg background bugfree :-)

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/850#issuecomment-65448253
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