Move long card number to back of physical card

[JustJordds (Jordan)]

This was mentioned before and @hugo did give some reasoning behind it all (albeit this is from Dec 18):

Monzo investor card - design concept (By Brice Corbin)

Just to be clear, our current setup is 100% intentional. There are some easy-to-miss benefits in using good old OCR embossed type. One is to make the card camera-friendly (already commented before, maybe not that important of a reason anymore). It also makes instantly obvious what’s the front face of the card, which is important when you need the slot-in the card in an ATM or POS (even though some machines have now readers in both sides). Another one is that in some places (this happens abroad…

I’m honestly not bothered or swayed either way - embossed looks like most normal cards and non-embossed has a bit more of a “design” edge but meh