Raspberry Pi Zero W Case

Made the following modifications to [this simple, excellent design by iakouben](https://www.thingiverse.com/thing:2349678):
- Remove bevel on bottom (easier for 3D-printing, no need for supports)
- Extended depth of bottom platform to allow for four M2 screws to anchor the RPi in place
- Punched holes into the bottom and top part to allow M2 screws to secure both the lid and RPi in place