Use Title: meta instead of explicit <h1>

Author: tantek

css-counter-styles-3/Overview.bs

@@ -1,6 +1,5 @@
-<h1>CSS Counter Styles Level 3</h1>
-
 <pre class=metadata>
+Title: CSS Counter Styles Level 3
 Shortname: css-counter-styles
 Level: 3
 Status: ED