[openstreetmap-website] add browse symbols (Osmic) of openstreetmap-carto 2.31.0 (#999)

[Tom Hughes]

Merged as 601f1609ab112b8fea55124dd6c04b3964992759.

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https://github.com/openstreetmap/openstreetmap-website/pull/999#issuecomment-116165085
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