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

[Tom Hughes]

Why can't all these damned sites agree on one standard? How many of these tags are we going to be expected to add? How big does a site have to be before it becomes impossible for us to tell them to go take a long walk off a short pier when they come up with this nonsense...

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1066#issuecomment-145636410
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