Auto move/prompt to move savings to highest rate

[awjdean]

@anon99402360

I think a good fix would be to just go into the pot, click on current supplier. Select new supplier from a list Monzo does the rest of the switching.

This sounds similar to the feature suggested here:

Ability to change pot types and keep history

I think it would be great to be able to change the pot type from regular to savings and potentially back again (if balance fell below min savings value) without having to create a new one and transfer the money. The benefit for me would be that I would keep my history on the pot which I find useful.