Make working login screen cards

[edgarogh]

Currently, there's a generic login card + an hard-coded AppelNonSurtaxé (yeah that's me 😊) card.

In order not to leak the user list, I was envisioning a localStorage-stored (or cookie-stored) local list of users that would be created after a first successful login attempt.

This list could also only include accounts the local browser has already logged onto.

Signing out should not clear this list, the only way to effectively clear it would be:

• Clearing browser data
• (maybe) A specifically-made button on the login page

Could benefit from #8.