Refactor ADS1231 library to dedicated repository

[amotl]

Coming from GH-27 and [1], we found we do not use the ADS1232 chip at all, yet. What we do use, is the ADS1231 chip, supported by the Arduino library by @aerowind, originally shared on the Arduino forum [3].

It should be pulled into a separate repository, in order to make it easier to consume.

[1] https://community.hiveeyes.org/t/code-fur-ads1231/286
[2] https://github.com/hiveeyes/arduino/tree/main/libraries/ADS1231
[3] https://forum.arduino.cc/t/spi-load-cell-chip-ads1231/128267/6

[amotl]

We refactored the library into a dedicated repository ¹, and GH-59 concluded the migration by pulling the library from there, via PlatformIO configuration (GH-58).

Footnotes

1. https://github.com/hiveeyes/aerowind-ads1231 ↩