[feature]: Add example for consuming infrastructure from other repositories

[fullykubed]

Prior Search

• [X] I have already searched this project's issues to determine if a similar request has already been made.

What new functionality would you like to see?

An example of the stack being used to deploy infrastructure modules from other repositories

How would you use this new functionality?

Many users will not have a mono-repository setup and may want to develop infrastructure modules in other repos but still deploy on the stack repo.

What primary components of the stack would this impact?

website, reference

Code of Conduct

• [X] I agree to follow this project's Code of Conduct