Highlight code with Prism on 'turbolinks:load' [ci skip]

guides/assets/javascripts/guides.js

@@ -27,6 +27,8 @@
   if (window.location.protocol === "file:") Turbolinks.supported = false;
 
   document.addEventListener("turbolinks:load", function() {
+    Prism.highlightAll();
+
     var guidesMenu = document.getElementById("guidesMenu");
     var guides     = document.getElementById("guides");