Build PCB for MerCEVes

[jlin25]

[jlin25]

On Saturday I finished the rough draft. We decided to shift everything back to one pico and Kelvin told me to change the level converter to an IC chip rather than a pcb. I also made some other edits, like adding a diode to the 5 to 3V3 level shifter, swapping the header orientation, and moving the mount to ground. Also, I changed the capacitors for the IC chips (had to consider capacitance, voltage rating, and channels) I picked out.