update Lighthouse URL

saves a HTTP redirect :-)

site/content/docs/5.2/customize/optimize.md

@@ -77,7 +77,7 @@ Whenever possible, be sure to compress all the code you serve to your visitors.
 
 While minifying and using compression might seem like enough, making your files non-blocking ones is also a big step in making your site well-optimized and fast enough.
 
-If you are using a [Lighthouse](https://developers.google.com/web/tools/lighthouse/) plugin in Google Chrome, you may have stumbled over FCP. [The First Contentful Paint](https://web.dev/fcp/) metric measures the time from when the page starts loading to when any part of the page's content is rendered on the screen.
+If you are using a [Lighthouse](https://developer.chrome.com/docs/lighthouse/overview/) plugin in Google Chrome, you may have stumbled over FCP. [The First Contentful Paint](https://web.dev/fcp/) metric measures the time from when the page starts loading to when any part of the page's content is rendered on the screen.
 
 You can improve FCP by deferring non-critical JavaScript or CSS. What does that mean? Simply, JavaScript or stylesheets that don't need to be present on the first paint of your page should be marked with `async` or `defer` attributes.