Use Title: meta instead of explicit <h1>

Author: tantek

css-transitions-2/Overview.bs

@@ -1,5 +1,3 @@
-<h1>CSS Transitions Level 2</h1>
-
 <style type="text/css">
   table.event-state-transitions {
     width: 100%;
@@ -19,6 +17,7 @@
 </style>
 
 <pre class='metadata'>
+Title: CSS Transitions Level 2
 Status: ED
 Work Status: Exploring
 Shortname: css-transitions-2