Demos: More attention for 3rd party plugin demos

[jaspermdegroot]

Currently the 3rd party plugin demos don't get much attention and are a bit hard to find at the bottom of the navmenu. We should improve that. For starters giving them a section on the homepage, but there are probably a few other things we can do to make them stand out more.

The datepicker and nested listview demos should be moved to the 3rd party section in the navmenu since they use external plugins.

[RedWolves]

Came here looking for this issue. I agree with moving the Datepicker out of the side nav and move it at least to 3rd Party Plugin demos as it's providing a false hope that there is a supported datepicker widget in mobile.

https://twitter.com/raymondcamden/status/536981013574864897

[arschmitz]

Lets make sure we get this addressed before 1.5 since it will then be even more confusing with some parts of ui being included (but not datepicker).