Clean up headers

Updates headers to match style guide and makes them consistent
throughout pages in the GUI. Removes instances where a header
element existed and a different header style was being applied.
For example, <h2 class="h4">

Tested: Ran GUI locally and verified that headers look consistent
and have the appropriate sizing while using Chrome, Firefox and
Safari.

Change-Id: I187136298ed2bfd36c40c2b80d5a4f20947cbe56
Signed-off-by: beccabroek <beccabroek@gmail.com>
diff --git a/app/configuration/controllers/date-time-controller.html b/app/configuration/controllers/date-time-controller.html
index 78d693b..6e1e24d 100644
--- a/app/configuration/controllers/date-time-controller.html
+++ b/app/configuration/controllers/date-time-controller.html
@@ -1,12 +1,10 @@
 <loader loading="loading"></loader>
 <div id="configuration-date-time">
-  <div class="row column">
-    <h1>Date and time settings</h1>
+  <h1>Date and time settings</h1>
+  <div class="column small-12 page-header">
+    <h2>Set date and time manually or configure a Network Time Protocol (NTP) Server</h2>
   </div>
   <form class="time__form" role="form" action="">
-    <div class="page-header">
-      <h2 class="bold h4">Set date and time manually or configure a Network Time Protocol (NTP) Server</h2>
-    </div>
     <fieldset>
       <div class="column large-8">
         <div class="row column">