code: def _copy_binder_reqs(app, binder_conf):
      
      path_reqs = binder_conf.get('dependencies')
      for path in path_reqs:
          if not os.path.exists(os.path.join(app.srcdir, path)):
              raise ValueError(("Couldn't find the Binder requirements file: {}, "
                                "did you specify the path correctly?".format(path)))
  
      binder_folder = os.path.join(app.outdir, 'binder')
      if not os.path.isdir(binder_folder):
          os.makedirs(binder_folder)
  
      # Copy over the requirements to the output directory
      for path in path_reqs:
          shutil.copy(os.path.join(app.srcdir, path), binder_folder)
docs: Copy Binder requirements files to a "binder" folder in the docs.