Check header for url - PP in url to show payment UI

[Tymmmy]

Context

Payment pointer urls on the live wallet should show a payment UI.
User has a payment pointer they want to send money to, so we need to check the urls header and Accept key values. If they contain application/json or application/spsp4+json, then return normal OP details for wallet address.
If the above are not present redirect to interledgerpay.com with the recepients PP in the url.

Example fynbos - https://fynbos.me/radu

Todos

• implement redirect url as described above