Old UI designs

The upcoming UI design can be found at https://www.figma.com/file/TxuhKDUzjxjfe7ug3qP4eD/Tumpa?node-id=619%3A915&t=lh0AiZhZLatVedmA-0

UI demo from main branch

Resetting Yubikey

Generating new OpenPGP key and exporting public key

Writing subkeys to a Yubikey