[openstreetmap-website] Strange + and - characters on zoom controls (#164)

[Mattias Bengtsson]

Merged [a fix](https://github.com/kartena/Leaflet.zoomslider/commit/ca614e1352477d51003a5705b4bc71939d47f463) for this now that moves the +/- symbols into the CSS instead (where it is more easily overridable).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/164#issuecomment-10741112
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