Remove pH measurement functionality
Remove pH measurement functionality

The focus is not to have a lot of sensors at the moment. Building for
d1_mini got errors for eeprom so this is the perfect time to remove some
unused code. Later in the project I will re-add the functionality.

Signed-off-by: Robin Hagman <a0ad21b4a5c77bde0f74c8a70cf9b810eabd0434@gmail.com>

rhagman/sustainable-green-plants