Support OG HTML metadata

[krainboltgreene]

  <%# Facebook Open Graph %>
  <%# DYNAMIC: <meta property="fb:app_id" content="123456789"> %>
  <%# DYNAMIC: <meta property="og:url" content="https://www.clumsy-chinchilla.club/page.html"> %>
  <%# DYNAMIC: <meta property="og:type" content="website"> %>
  <%# DYNAMIC: <meta property="og:title" content="Content Title"> %>
  <%# DYNAMIC: <meta property="og:image" content="https://www.clumsy-chinchilla.club/image.jpg"> %>
  <%# DYNAMIC: <meta property="og:image:alt" content="A description of what is in the image (not a caption)"> %>
  <%# DYNAMIC: <meta property="og:description" content="Description Here"> %>
  <%# DYNAMIC: <meta property="og:site_name" content="Site Name"> %>
  <%# DYNAMIC: <meta property="og:locale" content="en_US"> %>
  <%# DYNAMIC: <meta property="article:author" content=""> %>

  <%# Twitter Card %>
  <%# DYNAMIC: <meta name="twitter:card" content="summary"> %>
  <%# DYNAMIC: <meta name="twitter:site" content="@site_account"> %>
  <%# DYNAMIC: <meta name="twitter:creator" content="@individual_account"> %>
  <%# DYNAMIC: <meta name="twitter:url" content="https://www.clumsy-chinchilla.club/page.html"> %>
  <%# DYNAMIC: <meta name="twitter:title" content="Content Title"> %>
  <%# DYNAMIC: <meta name="twitter:description" content="Content description less than 200 characters"> %>
  <%# DYNAMIC: <meta name="twitter:image" content="https://www.clumsy-chinchilla.club/image.jpg"> %>
  <%# DYNAMIC: <meta name="twitter:image:alt" content="A text description of the image conveying the essential nature of an image to users who are visually impaired. Maximum 420 characters."> %>
  <%# OEmbed %>
  <%# DYNAMIC: <link rel="alternate" type="application/json+oembed" href="https://www.clumsy-chinchilla.club/services/oembed?url=http%3A%2F%2Fwww.clumsy-chinchilla.club%2Ffoo%2F&amp;format=json" title="oEmbed Profile: JSON"> %>
  <%# DYNAMIC: <link rel="alternate" type="text/xml+oembed" href="https://www.clumsy-chinchilla.club/services/oembed?url=http%3A%2F%2Fwww.clumsy-chinchilla.club%2Ffoo%2F&amp;format=xml" title="oEmbed Profile: XML"> %>