Add support for Dvorak mapping excluding Yubikeys

Yubikeys are a popular keyboard-based OTP solution, but they don't support the Dvorak layout, only QWERTY and AZERTY. This adds a "Dvorak->QWERTY (no Yubikeys)" option to the "For Dvorak Users" section, which will allow users to type in Dvorak, but Yubikey keypresses will show up as QWERTY to the system.