Demonstrate the Linked items elements

[JanLenoch]

Motivation

One of the elements in Kentico Cloud content types is called Linked items (formerly "modular content"). It contains a list of pointers to other content items. These can be rendered as either hyperlinks or in full in the app.

Proposed solution

Make use of the Related project references element in the Project reference content type to demonstrate the feature.

Additional context

As advertised above, render the related references as either hyperlinks or as partially rendered. For instance, in the form of "[Name of the related reference] ([Started at] - [Finished at])".