Add opengraph balises

[treyssatvincent]

Theses opengraph's balises should be added :

og:title
og:type
og:image
og:url

If the page is an article :

article:published_time
article:author
article:section OR article:tag

Ref : http://ogp.me/

[treyssatvincent]

og:title : title of the page og:type : article or website og:image : featured image if it's an article, or a logo if not available og:url : url of the page article:section OR article:tag : Add Section on the frontmaker or use tags