Add Template Integration example

[anubisthejackle]

One of the areas that I struggle with Mantle is understanding how to integrate with templates. This is likely due to this being one of the areas where Mantle differs from Laravel.

It would be helpful to see an example of integrating a Mantle route with a template--I'm thinking Twenty Twenty-Two--so we can get an idea of how we could do that within our own templates.