old_contents: mapping = [
      ("site-example.conf", "/etc/nginx/sites-available/site-example.conf"),
      ("index.html.tmpl", "/var/www/html/index.html")
  ]
  
new_contents: mapping = {
      "files": [
          ("site-example.conf", "/etc/nginx/sites-available/site-example.conf")
      ],
      "templates": [
          ("index.html.tmpl", "/var/www/html/index.html")
      ]
  }
  
subject: Implement new templates mapping