Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.

static/js/custom-jekyll/tags.js

@@ -0,0 +1,15 @@
+$( document ).ready(function() {
+  // Shows permalink when term name is hovered over
+  $(".glossary-injector").each(function() {
+    var placeholder = $("#" + $(this).data("placeholder-id"));
+    var originalContent = placeholder.html();
+
+    var glossaryDef = $($(this).find(".injector-def")[0]).html();
+
+    $(this).mouseenter(function() {
+      placeholder.html(glossaryDef);
+    }).mouseleave(function(){
+      placeholder.html(originalContent);
+    });
+  });
+});