Describe labels and submit rules in project owner guide

Change-Id: I3f52692757811858c03b85820f8a718e0815ffce
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Add section about email notifications to project owner guide

Change-Id: I8e6483e89ebe09c994d1b194118f4b412fcbe7c1
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Add a section about project dashboards to project owner guide

Change-Id: I33b7f5e4c585387cd81439cf7141ef7c5b18fd41
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>