[openstreetmap-website] Revised road key and icons for data browser (#1070)

[Tom Hughes]

Merged as f9570c4f054411c92007a146683f9f4724c1f9db.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1070#issuecomment-152870636
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