fix: add missing sample app paths to oathkeeper config (ory#2058)

Add "welcome,registration,login,verification" and "**.png" to the paths oathkeeper forwards to self service ui.

contrib/quickstart/oathkeeper/access-rules.yml

@@ -26,7 +26,7 @@
     preserve_host: true
     url: "http://kratos-selfservice-ui-node:4435"
   match:
-    url: "http://127.0.0.1:4455/<{error,recovery,verify,auth/*,**.css,**.js}{/,}>"
+    url: "http://127.0.0.1:4455/<{welcome,registration,login,verification,error,recovery,verify,auth/*,**.css,**.js,**.png}{/,}>"
     methods:
       - GET
   authenticators: