Replace dead link with a relevant GitHub wiki page.

index.html

@@ -54,7 +54,7 @@ <h3>Sparkle is an easy-to-use software update framework for Cocoa developers.</h
                 <p>But this little framework's got a lot of features packed inside! Check 'em out:</p>
                 <ul class="features">
                     <li>True self-updating--<strong>no work required from the user.</strong></li>
-                    <li>Uses <strong><a href="http://connectedflow.com/appcasting/">appcasts</a></strong> for release information.</li>
+                    <li>Uses <strong><a href="https://github.com/sparkle-project/Sparkle/wiki/Publishing-An-Update">appcasts</a></strong> for release information.</li>
                     <li><strong>Displays release notes</strong> to the user via WebKit.</li>
                     <li>The user can choose to <strong>automatically download and install</strong> all updates.</li>
                     <li>Displays a <strong>detailed progress window</strong> to the user.</li>