code: def copy_resources_to_log_dir(log_dir):
          
          css_path = resource_filename(Requirement.parse("egat"), "/egat/data/default.css")
          header_path = resource_filename(Requirement.parse("egat"), "/egat/data/egat_header.png")
          shutil.copyfile(css_path, log_dir + "/style.css")
          shutil.copyfile(header_path, log_dir + "/egat_header.png")
  
          return log_dir + os.sep + "style.css"
docs: Copies the necessary static assets to the log_dir and returns the path 
          of the main css file.