Present demonstration content in Home-mode

There are no demonstrations in the home content (mainly on account of the quality of the demos - they are not up to the standard of the examples, with full documentation and validated to work in new releases).

Minimally this is about establishing rules of engagement are on how demonstrations are to be produced (and inventorying existing demonstration content), on how demonstrations are to be shown in the tools, and especially who is responsible for their maintenance going forward. 

Furthermore: if a mutually acceptable plan is available, the changes to Home mode shall contain a section for demonstrations (or demonstrations shall be folded in to examples and displayed accordingly).

Acceptance criteria

If rules of engagement have been accepted, and the ownership/responsibility model of demonstrations is agreed upon: Qt Creator presents demonstrations accordingly. If not: Qt Creator presents no demonstration content.