updated /.well-known/assetlinks.json parsing and test URLs

Author: tsunoyu

.github/pull_request_template.md

@@ -7,4 +7,7 @@ Description of the changes...
 <!-- List the pages that should be automatically tested as part of your custom metric changes. -->
 **Test websites**:
 
-- https://example.com/
+- https://www.on.com/
+- https://www.amazon.co.jp/
+- https://www.libero.it/
+