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

[Mikel Maron]

Adding more detail in the description meta-tag, and adding additional meta-tag, is an easy way to improve sharing of OSM links. For instance, a link to an OSM feature can include the name and type of feature in the description meta-tags.

Related to https://github.com/openstreetmap/openstreetmap-website/issues/739, which specs out possibilities and issues for addition of map image during sharing.

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