chore: move firmware files to firmware/ folder

feat: add avr-device lib

feat: add button events

feat: make ports match pcb layout

feat: improve number generation

feat: use u8 everywhere

feat: use u8 in filled_sipo instead of u16

feat: use eeprom from avr-hal

feat: add eeprom support

feat: add guess and number increment animations

feat: make first current number 0 instead of guessing number

chore: update formatting

fix: yellow leds remained active sometimes

feat: add inline tags to compact binary size

Initial commit