pcb: Minor fixes

pcb: Add BL-5C

pcb: Add gerber recipe to Makefile

pcb: Fix issues, Bump version

power switch placement
connect button voltage rail to battery
boot pin default pull direction

src: Add battery monitor

src: Experiment with sleep mode

src: Implement basic functionality

src: Attempt debouncing

src: Working checkpoint

src: Add placeholder font

src: Experiment with e-ink

pcb: Fine-tune PCB

src: Add numeric display

src: Fix pins

src: Port to f030

pcb: Generate BOM and placement files

pcb: Move battery detection, Change to stm32f030Cx

src: Invert colors

pcb: Fix FFC positioning, Adapt to stm32, Add EEPROM, power switch IC

pcb: Add test points