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

[Tom Hughes]

The big problem I see is that we will have no idea what language to use for the description because what twitter/facebook/whatever fetches the page they won't be logged in, or presumably sending any Accept-Language header so we will just default to english.

In any case in the first instance I was assuming we would just do a simple fixed description, not try and generate something custom for each different page.

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