Update README.md

Informed visitors that we have moved. 

Author: marcoscaceres-remote

README.md

@@ -1,9 +1,4 @@
-This is a non-official version of the proposal at: <a href="http://dvcs.w3.org/hg/html-proposals/raw-file/tip/responsive-images/responsive-images.html">http://dvcs.w3.org/hg/html-proposals/raw-file/tip/responsive-images/responsive-images.html</a>
+This repo is no longer being maintained
+=======================================
 
-This repo is indended solely for the sake of basic issue tracking, and public contributions to the editing and formatting of the proposal. Discussion of potential/outstanding issues with the proposal should remain on the <a href="mailto:public-html@w3.org">HTML WG mailing list</a>, <a href="public-respimg@w3.org"><abbr title="Responsive Images Community Group">RICG mailing list</a>, or both.
-
-**Issue tracking:** <a href="https://github.com/Wilto/draft-prop/issues/">https://github.com/Wilto/draft-prop/issues/</a>
-
-**Draft preview:** <a href="https://github.com/Wilto/draft-prop/issues/">http://wilto.github.com/draft-prop/ResponsiveImages.html</a>
-
-**Formally Published:** http://dvcs.w3.org/hg/html-proposals/raw-file/tip/responsive-images/responsive-images.html
+We've moved to the [Responsive Images Community Group Organization](http://responsiveimages.org).