Remove the scriptz submodule and hard-commit the files.

The submodule is a leftover from when this project was intended to work
as a series of microservices. It was meant to provide common
functionality to the builds for every microservice. That's no longer the
case, and the submodule is a pain-point both in on-boarding new
developers and running the Docker build.

script/include/setup_functions.inc.sh

@@ -0,0 +1,58 @@
+# setup_functions.inc.sh: Functions used by the setup script
+
+install_pipenv() {
+  return_code=0
+
+  # Ensure we are not in a virtual env already
+  if [ -z "${VIRTUAL_ENV+is_set}" ]; then
+    if ! check_system_pip_for pipenv; then
+      # pipenv is not installed, so install it
+      echo "Installing pipenv..."
+      pip install pipenv
+      # Capture pip exit code
+      return_code="${?}"
+    fi
+  fi
+
+  return "${return_code}"
+}
+
+check_for_existing_virtual_environment() {
+  local python_version="${1}"
+  local target_python_version_regex="^Python ${python_version}"
+
+  # Check for existing venv, and if one exists, save the Python version string
+  existing_venv_version=$($(pipenv --py) --version)
+  if [ "$?" = "0" ]; then
+    # Existing venv; see if the Python version matches
+    if [[ "${existing_venv_version}" =~ ${target_python_version_regex} ]]; then
+      # Version strings match, valid existing environment is present
+      return 0
+    fi
+  fi
+
+  # No valid virtual environment found
+  return 1
+}
+
+create_virtual_environment() {
+  local python_version="${1}"
+
+  # Create a new virtual environment for the app
+  # The environment will be in a directory called .venv off the app
+  # root directory
+  echo "Creating virtual environment using Python version ${python_version}..."
+  PIPENV_VENV_IN_PROJECT=true pipenv --python "${python_version}"
+  return $?
+}
+
+install_sass() {
+  if ! type sass >/dev/null; then
+    if type gem >/dev/null; then
+      echo 'Installing a sass compiler (gem)...'
+      gem install sass
+    else
+      echo 'Could not install a sass compiler. Please install a version of sass.'
+    fi
+  fi
+}