Improve UX to migrate normal account to keycard account

[guylouis]

Problem:
when a normal (his keys are stored on the phone) user wants to migrate his account to a keycard then, he is been taken through this flow
https://www.figma.com/file/Z2T0QW0TgIrJEeTjgBidAG/Untitled?node-id=0%3A1

Primarily, this flow has been considered

• hard to locate for users that want to migrate
• complex (naming and copy are not obvious)
  Also
• the choose storage screen is not providing any choice to the user so it could be removed or simplified to an information screen

How to improve this?
This flow needs design eyes to simplify the user experience
An idea would be to add in the '...' screen an entry which would be 'move account to keycard' and which by default would keep the database, it would thus be much simpler for the user to understand and proceed. MOre advanced users could still go through 'manage keys and storage'

cc fyi @bitgamma @churik

[churik]

I believe that can be closed after #12395
@guylouis please reopne if still relevant

[bitgamma]

I think it would be nice to reopen this because this was about simplyfing the flow (both from logged in and logged out state) and making it easier to find

[churik]

closing due to re-design, label recheck added for future re-consideration