UI tweaks to Backpack Connect

- [x] I am not a user should be a hyperlink in a line below the buttons (#696) - f9ebf87
- [x] Revoke access for <domain>" is now on the right side of the settings page (#700) - c46eca0
- [x] Display window.confirm() dialog before revoking backpack connect issuer (#701) - 3311c4f