title: How do you enable the new .bg-gradient- utilities?
body: <p><a href="https://blog.getbootstrap.com/" rel="noreferrer">https://blog.getbootstrap.com/</a> says </p>
  
  <p>And when you use $enable-gradients, you’ll enable the new .bg-gradient- utilities (disabled by default) for use in navbars and more.</p>
  
  <p>Q: How do I use $enable-gradients? Up until now I've just downloaded the bootstrap.css and .js files. But now apparently I have to compile them?</p>