v0.1.15 - Re-organizing the Terragrunt AWS Directory Structure

This set of changes aligns with the how the GCP Terragrunt environment folders are layed out. This sets it up so that there are less env name variables to change in the Terragrunt files by using the directory structure for that purpose instead. This seems to be easier to use and see.

The docs on the easy way and the harder way are also updated with this new directory structure.