remove screenshots

git-svn-id: https://plugins.svn.wordpress.org/jabze-chat/trunk@768794 b8457f37-d9ea-0310-8a92-e5e31aec5664
add screenshots

git-svn-id: https://plugins.svn.wordpress.org/jabze-chat/trunk@768795 b8457f37-d9ea-0310-8a92-e5e31aec5664