TJBot body design updates for Pi Zero 2

[jweisz]

Need to check the existing laser cuts & 3D print files to see if they are compatible with RPi 4.

Need to design new laser cuts & 3D print files to be compatible with a Pi Zero 2.

[jweisz]

Lisa will do a test 3D print of the bottom piece

[jweisz]

@ljmwaugh verified that the 3D print was updated for Pi 4, which means that the laser cuts need to be updated for Pi 4.

@jweisz will speak to the person who did the laser cuts (and create a new issue for this)

[jweisz]

Blocked because there are no Pi Zero 2's available in the world anywhere whatsoever.