docs: add news item and link release notes for 12.0.6

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/index.html b/docs/index.html
index 6e55f80..2520841 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -16,6 +16,17 @@
 
 <h1>News</h1>
 
+<h2>January 23, 2017</h2>
+<p>
+<a href="relnotes/12.0.5.html">Mesa 12.0.6</a> is released.
+This is a bug-fix release.
+<br>
+NOTE: This is an extra release for the 12.0 stable branch, as per developers'
+feedback. It is anticipated that 12.0.6 will be the final release in the 12.0
+series. Users of 12.0 are encouraged to migrate to the 13.0 series in order
+to obtain future fixes.
+</p>
+
 <h2>January 5, 2017</h2>
 <p>
 <a href="relnotes/13.0.3.html">Mesa 13.0.3</a> is released.