admin hero-unit to jumbotron and updated welcome message to be slightly less embarassing

public/templates/admin/index.tpl

@@ -1,5 +1,5 @@
 
-<div class="hero-unit">
+<div class="jumbotron">
 	<h1>Welcome to NodeBB</h1>
 	<br />
 	<p>
@@ -8,7 +8,7 @@
 		<a target="_blank" href="http://www.nodebb.org" class="btn btn-default btn-lg"><i class="icon-github-alt"></i> Get Themes</a>
 		<a target="_blank" href="http://www.nodebb.org" class="btn btn-default btn-lg"><i class="icon-twitter"></i> dcplabs</a>
 	</p>
-	<p><small>You are running <strong>NodeBB v{version}</strong>. This is where we will check to make sure your <strong>NodeBB</strong> is latest, etc.</small></p>
+	<p><small>You are running <strong>NodeBB v{version}</strong>. Always make sure that your <strong>NodeBB</strong> is up to date for the latest security patches and bug fixes.</small></p>
 </div>