def file_exists?(file_path)
      if @site.respond_to?(:in_source_dir)
        File.exist? @site.in_source_dir(file_path)
      else
        File.exist? Bunto.sanitized_path(@site.source, file_path)
      end
    end
def file_exists?(file_path)
      if @site.respond_to?(:in_source_dir)
        File.exist? @site.in_source_dir(file_path)
      else
        File.exist? Bunto.sanitized_path(@site.source, file_path)
      end
    end
Checks if a file already exists in the site source