[openstreetmap-website] add details in description meta tag; and add og:description and twitter:description (#1066)

[Holger Jeromin]

Can this be closed after https://github.com/openstreetmap/openstreetmap-website/commit/e62e879b3bb70bb93fe96d3cc669f219cd23ed8d ?

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1066#issuecomment-151415934
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