docs(programmatic): add caveat about removing artifacts

[patrickhulce]

closes #4346

[patrickhulce]

does this help @ganlanyuan?

[ganlanyuan]

Yes, that's helpful!
Thanks

[ganlanyuan]

But this doesn't work for me, I just get the results of undefined:

return lighthouse(url, opts, config).then(results => {
  delete results.artifacts;
  chrome.kill().then(() => {
    return new ReportGenerator().generateReportHtml(results);
  })});

While this works:

return lighthouse(url, opts, config).then(results =>
  chrome.kill().then(() => {
    delete results.artifacts;
    return new ReportGenerator().generateReportHtml(results);
  }));

[paulirish]

@ganlanyuan this is true. implicit return. updated the code to be more obvious about this. :)

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