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

[Cristian Consonni]

I have asked on the `[wikimedia-labs](https://www.mediawiki.org/wiki/Wikimedia_Labs)` channel or IRC and I have been told that OAuth has an "authenticationonly" feature that can be used to 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1146#issuecomment-179972282
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