Restructure the structure

[paskino]

Rename the the directory examples to tutorials.

Use the examples to host some simpler snippets of code referring to structures in CIL.

We expect to have a structure following cil's with io, optimisation etc etc

[paskino]

These should also be tested automatically with some GHA or similar

[lauramurgatroyd]

CLosing this as we now have the demos folder