DELETE unused banners

git-svn-id: https://plugins.svn.wordpress.org/dialogfeed/trunk@984421 b8457f37-d9ea-0310-8a92-e5e31aec5664
MAJ README

git-svn-id: https://plugins.svn.wordpress.org/dialogfeed/trunk@984423 b8457f37-d9ea-0310-8a92-e5e31aec5664