Add comments to the index file

 - fairly simple again, though there's some inline js that needs to be
   moved out

go/go/templates/core/index.html

+<!-- include the base html template -->
 {% extends 'layouts/base.html' %}
+
+<!-- load django crispy forms' tags -->
 {% load crispy_forms_tags %}
 
+<!-- define the page title block -->
 {% block title %}
 SRCT Go &bull; A University Branded URL Shortener
 {% endblock %}
 
+<!-- define the content block for the page -->
 {% block content %}
-<script type="text/javascript">
-$(function() {
-  $("div_id_expires_custom").hide();
-  if ($("#id_expires_5").is(":checked")) {
-        $("#div_id_expires_custom").slideDown();
-      } else {
-          $("#div_id_expires_custom").slideUp();
-      }
-    $("#div_id_expires").click(function() {
-      if ($("#id_expires_5").is(":checked")) {
-        $("#div_id_expires_custom").slideDown();
-      } else {
-          $("#div_id_expires_custom").slideUp();
-      }
-  })
-})
-</script>
 
+<!-- define the page header div -->
 <div class="page-header" id="banner">
   <div class="row">
     <div class="col-md-12">
@@ -38,6 +27,36 @@ $(function() {
   </div>
 </div>
 
+<!-- call django crispy forms to render the go link creation form here -->
 {% crispy form %}
 
+<!-- load some JS to hide/show the custom date field -->
+<script type="text/javascript">
+$(function() {
+    // hide by default
+    $("div_id_expires_custom").hide();
+
+    // if the expires_custom checkbox is checked..
+    if ($("#id_expires_5").is(":checked")) {
+        // display the field
+        $("#div_id_expires_custom").slideDown();
+    } else {
+        // keep it up
+        $("#div_id_expires_custom").slideUp();
+    }
+
+    // if the expires_custom checkbox is clicked..
+    $("#div_id_expires").click(function() {
+        // if the expires_custom checkbox is checked..
+        if ($("#id_expires_5").is(":checked")) {
+            // display the field
+            $("#div_id_expires_custom").slideDown();
+        } else {
+            // keep it hidden 
+            $("#div_id_expires_custom").slideUp();
+        }
+    })
+})
+</script>
+
 {% endblock %}