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

[nemobis]

You can find more information on https://www.mediawiki.org/wiki/OAuth/For_Developers ; cc @Stype, @tgr in case they have something to add.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1146#issuecomment-179874502
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