code: def remove_index(app):
      """
      This removes the index pages so rediraffe generates the redirect placeholder
      It needs to be present initially for the toctree as it defines the navbar.
      """
  
      index_file = Path(app.outdir) / "index.html"
      index_file.unlink()
  
      app.env.project.docnames -= {"index"}
      yield "", {}, "layout.html"
  
imports: import os
  import sys
  from pathlib import Path
  from sphinx.application import Sphinx
label_desc: Use image node_id 1 for calling a global function with example usage: remove_index(app) without return types