[openstreetmap-website] Add Wikipedia authentication (#1146)

[Tom Hughes]

I don't see them listed in the OmniAuth strategy list at https://github.com/intridea/omniauth/wiki/List-of-Strategies so I'm guessing they don't.

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https://github.com/openstreetmap/openstreetmap-website/issues/1146#issuecomment-177868467
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