Help/About: Serve the image on the Freedoms page locally.

Serving the files locally is beneficial for reasons of privacy and speed.

Props garrett-eclipse, pputzer, hellofromTonya.
Fixes #46363.

git-svn-id: https://develop.svn.wordpress.org/trunk@49219 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/about.css

@@ -1113,7 +1113,7 @@
 }
 
 .freedoms-php .column .freedoms-image {
-	background-image: url('https://s.w.org/wp-content/themes/pub/wporg-main/images/freedoms-2x.png');
+	background-image: url('../images/freedoms-2x.png');
 	background-size: 100%;
 	padding-top: 100%;
 }