Update READMEs for Major Projects to Repo Requirements

[seveibar]

Repo requirements here: https://github.com/tscircuit/rfc/blob/main/rfcs/2023-07-08-repo-requirements.md

• tscircuit/pcb-viewer
• tscircuit/schematic-viewer
• tscircuit/react-fiber
• tscircuit/builder
• tscircuit/routing

[homie-gg]

This might have already been done via: Improve README, Support for 3d Components generated by footprint.