Remove obsolete Todo example

- if we want a nice Todo example, we should do http://todomvc.com/
For #2015: More tree and menu removal

- following 084d85f53346a67cfe59379fb713d7e9055a346f
For #2013: Change default session time to 1 hour

- used to be 12 hours, which is too long as we have the session heartbeat
- see also #1596
For #1596: Set time to idle to 5 hours

- this is a temporary workaround