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

[Chris Steipp]

@tomhughes, that is an unfortunate side effect, not the intent. I'd love to see more open-source projects use us for authentication / identity. If you have any issues getting setup, let me know.

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https://github.com/openstreetmap/openstreetmap-website/issues/1146#issuecomment-179951521
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