Updated store links

Author: awhitchurch

README.md

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 A unified platform library for the SensythingES3 family of ESP32-S3 sensor boards from Protocentral Electronics. The SensythingES3 library provides a consistent, modular API for all SensythingES3 boards, including:
 
-- **SensythingCAP**: 4-channel capacitance measurement using FDC1004 
-- **SensythingOX**: PPG/SpO2/HR measurement using AFE4400
+- [**SensythingCAP**: 4-channel capacitance measurement board using FDC1004](https://github.com/Protocentral/protocentral_sensything_hardware/blob/a9676be901be1587d2ffdf0083a7e478a88bb57d/hardware/SensythingCAP-v1-r2/pc_sensything_cap_v1_r2_schematic.pdf)
+- [**SensythingOX**: PPG/SpO2/HR measurement board using AFE4400](https://github.com/Protocentral/protocentral_sensything_hardware/blob/a9676be901be1587d2ffdf0083a7e478a88bb57d/hardware/SensythingOX-v1-r2/sensythingOX_v1_r2_schematic.pdf)
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 All boards share common ESP32-S3 hardware and communication infrastructure while supporting board-specific sensors through inheritance-based polymorphism.