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

[Mikel Maron]

For reference, here is where the meta-tags are added. 

https://github.com/openstreetmap/openstreetmap-website/blob/master/app/views/layouts/_head.html.erb#L28-L29

Not clear to me if both description and og:description metatags are necessary to cover everywhere we want better descriptions. Certainly for title, I think it just pulls from the title tag, doesn't require og:title.

In either case, need to set up the value of this/these metatags to https://github.com/openstreetmap/openstreetmap-website/blob/c9d35839befe92d916425baa4daec7dd77ade929/app/helpers/browse_helper.rb#L4 or something more expansive (including the type of feature)

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https://github.com/openstreetmap/openstreetmap-website/issues/1066#issuecomment-145996436
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