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

[fuddl]

maybe it would be an improvement to do something like ``<abbr title="Zoom in">+</abbr>``, ``<abbr title="Zoom out">-</abbr>`` or ``<abbr title="star this">★</abbr>``. 

right now the control buttons aren't read at all, are they?

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https://github.com/openstreetmap/openstreetmap-website/issues/850#issuecomment-66266481
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