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

[Mikel Maron]

After looking into it more, the only addition needed now is `og:title`, set to the same as `title`; some sites, like Slack, only pay attention to the OG tags. 

Facebook uses `title` if `og:title` is not set, so ok there. Could consider adding support for `X-Facebook-Locale` as @pnorman suggests, later on.

So in summary, I think adding `og:title` set to `printable_name` should be sufficient to close out this issue.


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