Use Title: meta instead of explicit <h1>

Author: tantek

css-transitions-1/Overview.bs

@@ -1,5 +1,3 @@
-<h1>CSS Transitions</h1>
-
   <style type="text/css">
     table.animatable-properties {
       border-collapse: collapse;
@@ -25,6 +23,7 @@
 
 
 <pre class="metadata">
+Title: CSS Transitions
 Status: ED
 Work Status: Refining
 Shortname: css-transitions