rework the home with screenshots

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1542917 13f79535-47bb-0310-9956-ffa450edef68
better with adding files

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1542918 13f79535-47bb-0310-9956-ffa450edef68