fix: connecting_routes script broken IO.puts

[robbie-sundstrom]

The IO.puts statement in the connecting_routes script wasn't working because it was taking a List of Lists of strings.

• Added a helper function that prints out the connecting routes more cleanly. Sorry for the messy commits, but this change is here: 7fa16b3
• mix formatted the function by our code standards as this made it much easier to parse

Example of the connecting routes printed out below:

[digitalcora]

mix formatted the function by our code standards as this made it much easier to parse

We could add the scripts path to .formatter.exs so it happens consistently with mix format / is included in CI.

[robbie-sundstrom]

@digitalcora I was right behind you! Pushed the change to the .formatter.exs right as you approved