3rd party hosted images

There's a few images that appear in the admin panel that are not locally hosted. For example:

https://i.imgur.com/OAXtYNg.png and https://s3-us-west-1.amazonaws.com/bt-partner-assets/paypal-braintree.png

They are still showing today, but maybe sometime in the future those could end up 404. The images should be moved to the /skin/ folder.