At the moment, each session lives in its own directory within src. As an instructor, I have found this hard to navigate. Most specifically, I've found it hard to find the concurrency module when I've been trying to do so on the fly.
src
android
bare-metal
borrowing
cargo
...
concurrency
I would personally like to see the sessions within the Rust Fundamentals, i.e. the main course, be put into their own directory. We could also create a welcome module for the prelude material. Something like this:
src
android
bare-metal
chromium
concurrency
fundamentals
borrowing
cargo
...
welcome
...