Better draft-07 announcement

Larger but gray text (to stand out without overwhelming), and
centered text (because it just looked weird off to the side).

Author: handrews

index.md

@@ -4,9 +4,11 @@ title: JSON Schema
 permalink: /
 ---
 
+***Draft-07 has been [published](documentation.md)!***
+{: style="color:gray; font-size: 150%; text-align: center;"}
+
 **JSON Schema** is a vocabulary that allows you to **annotate** and **validate** JSON documents.
 
-***Draft-07 has been [released](documentation.md)!***
 
 Advantages
 ----------