Publish: Added note about the plugins website's deprecation

Fixes jquery/jquery.com#134

Author: AurelioDeRosa

pages/docs/publish.md

@@ -4,6 +4,10 @@
 
 Publishing your plugin on the site is a three step process:
 
+<div class="warning">
+	The jQuery Plugin Registry is in read-only mode. New plugin releases will not be processed. We recommend moving to <a href="https://www.npmjs.com/">npm</a>, using "<a href="https://www.npmjs.org/browse/keyword/jquery-plugin">jquery-plugin</a>" as the keyword in your package.json. The npm blog has <a href="http://blog.npmjs.org/post/111475741445/publishing-your-jquery-plugin-to-npm-the-quick">instructions for publishing your plugin to npm</a>.
+</div>
+
 ## Add a Service Hook
 
 First, you'll need to enable the jQuery Plugins service hook on GitHub. On the