Clarity on type of Raspberry Pi in hardware build instructions

[kellytr]

There are two types of Rpis that a user may have. We should make it more clear for users to identify their Rpi and click to the respective build instructions.

Right now:

A clickable tab, with no previous description or indication. Users with Rpi Zero 2 Ws often miss the right tab.

Todo: Some visual or text indication (ex. Click here for Rpi 4B, here for Zero 2 instructions). TBD

[CamDavidsonPilon]

• missing vial cap S instructions
• visual "crooked" check
• IR LED bulb in first is a mistake
• "Manage" symbol
• "We'll set up the SD card first, and then plug in power"