Add reference images of assembled PCB in Production files Others.zip.

Fix soldermask in switches footprint. Fixes https://github.com/jakkra/ZSWatch-HW/issues/11

Update zswatch.kibot.yaml

- Remove S1, S2 and S4 from Sensor variant

- Remove environment variables from Kibot configuration

- Add CI/CD pipelines for documentation

- Add QR code library with link to the project

Update case CAD files.

- Add QR code library with link to the project

v4 design validated, remove warning in README.