Support FB & Twitter meta tags for nicer linking

[nickdos]

Similar issue in bie-plugin (issue 120).

See this article for background: https://www.freecodecamp.org/news/how-to-avoid-the-shaming-look-your-site-has-on-twitter-and-facebook-f2e8f4be568d/.

In short, add these meta tags to data resources, collection, institution and data provider pages:

<meta property="og:image" content="http://example.com/logo.jpg">
<meta property="og:image:type" content="image/png">
<meta property="og:image:width" content="1024">
<meta property="og:image:height" content="1024">

plus
og:url, og:type, og:title, og:description for FB.

For Twitter:
twitter:card,twitter:image,twitter:image:alt, twitter:description (note slightly different meta tag syntax)

[RobinaSanderson]

Doesn't need to be done before migration to the new infrastructure.
Add as a requirement in the new system.