Update README

Backlink to CADLAB.io has been added.

Updating to eliminate serial LCD connector, and to make a horizontal expansion possible. This simplifies using a box to contain the PCB

Small changes to connectors on the rear edge of the main board. Reposition the sensor and expansion connector Removed the LCD connector Repositioned the RGB LED

Removed V7 pgFocus

Change connection between analog and digital ground plans via a cutable trace, which means that both ground planes will be connected by default. Also pin 6 (RBEN) of AD5531 was mistakenly left floating, now connected to 5V line to force deactivation.

Latest version sent to manufacturing

Switchedd top two holes 1/8" Vias for mounting for chasis grounding

Changed connector for Expansion, cleaned up text

Minor changes