title: React old Favicon showing in new project
body: <p>so I had an old project created using react, where I used a custom favicon.
  Now the issue is, I'm working on a new project, but it's still using that old favicon.
  Funny enough, I don't even have a favicon anywhere, no code in the HTML header either.
  I'm getting this error in the console though.</p>
  <blockquote>
  <p>Proxy error: Could not proxy request /favicon.ico from localhost:3000
  to http://localhost:8080/.
  See <a href="https://nodejs.org/api/errors.html#errors_common_system_errors" rel="nofollow noreferrer">https://nodejs.org/api/errors.html#errors_common_system_errors</a> for
  more information (ECONNREFUSED).</p>
  </blockquote>
  <p>Any suggestions on what might be wrong ??</p>