code: def copy_artifacts(app):
      
      dest_path = app.builder.outdir + '/error'
      source_path = app.builder.srcdir + '/build_version_doc/artifacts'
      _run_cmd('cd ' + app.builder.srcdir)
      _run_cmd('rm -rf ' + dest_path)
      _run_cmd('mkdir -p ' + dest_path)
      _run_cmd('cp ' + source_path + '/404.html ' + dest_path)
      _run_cmd('cp ' + source_path + '/api.html ' + dest_path)
      dest_path = app.builder.outdir + '/_static'
      _run_cmd('rm -rf ' + dest_path)
      _run_cmd('mkdir -p ' + dest_path)
      _run_cmd('cp ' + app.builder.srcdir + '/_static/mxnet.css ' + dest_path)
docs: Copies artifacts needed for website presentation