Use Title: meta instead of explicit <h1>

Author: tantek

css-will-change-1/Overview.bs

@@ -1,6 +1,5 @@
-<h1>CSS Will Change Module Level 1</h1>
-
 <pre class='metadata'>
+Title: CSS Will Change Module Level 1
 Shortname: css-will-change
 Level: 1
 Status: ED