Site needs social media meta properties

[mzeinstra]

The site lacks social media meta properties which diminishes the richness of our social media outreach.

I suggest we add something like the following (draft) on our generic header and something programmatic on our statement pages:

<link rel="canonical" href="http://rightsstatements.org/en/" />
<meta property="og:locale" content="en_EN" />
<meta property="og:type" content="website" />
<meta property="og:title" content="RightsStatements.org" />
<meta property="og:description" content="RightsStatements.org provides 11 standardized rights statements for online cultural heritage." />
<meta property="og:url" content="http://rightsstatements.org/en/" />
<meta property="og:site_name" content="RightsStatements.org" />
<meta property="og:image" content="http://rightsstatements.org/files/images/logo.svg" />
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:description" content="RightsStatements.org provides 11 standardized rights statements for online cultural heritage." />
<meta name="twitter:title" content="RightsStatements.org" />
<meta name="twitter:image" content="http://rightsstatements.org/files/images/logo.svg" />
<meta name="twitter:creator" content="RightsStatements.org" />