[openstreetmap-website] Add details to opengraph meta tags (#1073)

[Mikel Maron]

@tomhughes curious to know, what's the release schedule of changes to openstreetmap-website?

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1073#issuecomment-153968085
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