chore: Migrate from config/ to files/ & use new files module recipe format (#36)

files/scripts/example.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Tell this script to exit if there are any errors.
+# You should have this in every custom script, to ensure that your completed
+# builds actually ran successfully without any errors!
+set -oue pipefail
+
+# Your code goes here.
+echo 'This is an example shell script'
+echo 'Scripts here will run during build if specified in recipe.yml'