Fix #1730 - CSS print permalink date and link

Author: bwbroersma

frontend/css/print.css

@@ -21,11 +21,16 @@ aside,
 .footlink,
 .panel-button-container,
 .panel-title a .icon,
-.timestamp,
+.timestamp > :not(a.permalink),
 #site-description {
   display:none !important;
 }
 
+/* print permalink */
+a.permalink::after {
+  content: ": " attr(href);
+}
+
 /* print design */
 header {
   position: absolute !important;