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/network-controller.html b/app/configuration/controllers/network-controller.html
index 22e5889..6500c0b 100644
--- a/app/configuration/controllers/network-controller.html
+++ b/app/configuration/controllers/network-controller.html
@@ -6,7 +6,7 @@
   <form class="net-config__form" role="form" action="">
     <section class="row column">
       <div class="column small-12 page-header">
-        <h2 class="inline h4">Common settings</h2>
+        <h2 class="inline">Common settings</h2>
       </div>
       <fieldset>
         <div class="column small-12 large-3">
@@ -36,7 +36,7 @@
     </section>
     <section class="row column">
       <div class="column small-12 page-header">
-        <h2 class="inline h4">IPV4 settings</h2>
+        <h2 class="inline">IPV4 settings</h2>
       </div>
       <fieldset>
         <div class="row column">
@@ -78,7 +78,7 @@
     </section>
     <section class="row column">
       <div class="column small-12 page-header">
-        <h2 class="inline h4">DNS settings</h2>
+        <h2 class="inline">DNS settings</h2>
       </div>
       <fieldset>
         <!-- Call Nameservers "DNS Servers" on the GUI -->
@@ -107,7 +107,7 @@
     <div class="screen-reader-offscreen modal-description">Change network settings</div><!-- accessibility only; used for screen readers -->
     <div class="page-header ">
       <span class="icon icon__warning inline"><span class="accessible-text" role="alert">Warning</span></span>
-      <h1 class="modal-title h4 inline">Change network settings</h1>
+      <h3 class="modal-title inline">Change network settings</h3>
     </div>
     <div class="modal__content">
       <p>Changing network settings may cause the system to become unavailable (e.g. changing the BMC IP address).