Move <h1> from react

Wordpress moves admin notices bellow the first heading. If we re-render
our heading inside react router we remove those notices. This way the
admin notice stays in the page.

[MAILPOET-949]

assets/js/src/help/knowledge_base.jsx

@@ -7,9 +7,6 @@ function KnowledgeBase() {
 
   return (
     <div>
-      <h1 className="title">
-        {MailPoet.I18n.t('pageTitle')}
-      </h1>
 
       <Tabs tab="knowledgeBase" />
 

assets/js/src/help/system_info.jsx

@@ -32,9 +32,6 @@ function KnowledgeBase() {
   const data = window.help_scout_data;
   return (
     <div>
-      <h1 className="title">
-        {MailPoet.I18n.t('pageTitle')}
-      </h1>
 
       <Tabs tab="systemInfo" />
 

views/help.html

@@ -2,6 +2,8 @@
 
 <% block content %>
 
+<h1 class="title"><%= __('Help') %></h1>
+
 <div id="mailpoet_help">
 
   <script type="text/javascript">
@@ -15,7 +17,6 @@
 <% endblock %>
 <% block translations %>
 <%= localize({
-  'pageTitle': __('Help'),
   'tabKnowledgeBaseTitle': __('Knowledge Base'),
   'tabSystemInfoTitle': __('System Info'),
   'knowledgeBaseIntro': __('Click on one of these categories below to find more information:'),