docs: Import 10.2.4 release notes

And add a news item.
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index d3882f0..8aef51a 100644
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@@ -16,6 +16,12 @@
 
 <h1>News</h1>
 
+<h2>July 78, 2014</h2>
+<p>
+<a href="relnotes/10.2.4.html">Mesa 10.2.4</a> is released.
+This is a bug-fix release.
+</p>
+
 <h2>July 7, 2014</h2>
 <p>
 <a href="relnotes/10.2.3.html">Mesa 10.2.3</a> is released.