Add pre-commit hook and improve with better linting

{{cookiecutter.project_slug}}/bin/install-hooks/pre-commit.sh

+#!/bin/bash
+
+if [ ! -f "setup.sh" ]; then
+  echo "pre-commit.sh must be executed with repository root as working directory!"
+  exit 1
+fi
+
+pre-commit install --hook-type pre-push