[HW] LS-PCB revision 1.

Revision of LS-PCB:
  - Include relay chain;
  - Now some MUXes are unnecessary, so remove them;
  - Turn I²C connection to bus, not MUX anymore;
  - Reorganize I/O pins;
  - Include voltage regulator.

Remove CAM files and mirrored layouts.

Update LS-PCB documentation (PDFs).