Fixes metatags - apparently string interpolation doesn't work in Jade mixins.

views/layout-document.jade

@@ -17,18 +17,18 @@ block docContents
 
 			meta(name="viewport", content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no")
 			+metaProp("name", document.OriginalFilename)
-			+metaProp("image", "https://pdf.yt/static/thumbs/#{document.SlugId}")
+			+metaProp("image", "https://pdf.yt/static/thumbs/" + document.SlugId)
 
 			+twitterProp("card", "summary")
 			+twitterProp("title", document.OriginalFilename)
-			+twitterProp("description", "Read and download #{document.OriginalFilename} for free!")
-			+twitterProp("image:src", "https://pdf.yt/static/thumbs/#{document.SlugId}")
+			+twitterProp("description", "Read and download " + document.OriginalFilename + " for free!")
+			+twitterProp("image:src", "https://pdf.yt/static/thumbs/" + document.SlugId)
 
 			+facebookProp("type", "website")
 			+facebookProp("title", document.OriginalFilename)
-			+facebookProp("url", "https://pdf.yt/d/#{document.SlugId}")
+			+facebookProp("url", "https://pdf.yt/d/" + document.SlugId)
 			+facebookProp("site_name", "PDFy")
-			+facebookProp("image", "https://pdf.yt/static/thumbs/#{document.SlugId}")
+			+facebookProp("image", "https://pdf.yt/static/thumbs/" + document.SlugId)
 
 			if !document.Public
 				// Keep Google and friends from indexing this document (hopefully), if they've somehow run across it...