[Discussion] Merge assets in a single Godot project

[henriiquecampos]

Currently, the assets are in individual Godot projects, this is good if we want to define individual properties for each project, e.g. window size.

But I think that it can be more beneficial if all assets are part of the same project so that their integration is seamless, e.g. use the controller kit to demo a character physics. Thus giving more context to demos. This happened with the Juicenness demo where I used the controller kit.

This would also avoid duplication of assets.