Portia: changed the theme URI (#7740)

portia/style.css

@@ -1,6 +1,6 @@
 /*
 Theme Name: Portia
-Theme URI: https://wordpress.org/themes/portia/
+Theme URI: https://themeshaper.com/portia/
 Author: Automattic
 Author URI: https://automattic.com/
 Description: Portia is a simple business theme for a legal service.