Revert "Add library: CalibrationLib (#6532)"

This reverts commit c16af21.

Author: RacoonX65

repositories.txt

@@ -5,7 +5,6 @@ https://github.com/TheBlackSwitch/PS2Keyboard
 https://github.com/aiplayuser/esp8266easylib.git
 https://github.com/Circuit-Digest/GeoLinkerLite
 https://github.com/RacoonX65/LightweightIoT-Arduino-Lib
-https://github.com/RacoonX65/CalibrationLib.git
 https://github.com/RCmags/CN0391
 https://github.com/Init-io/InitMQTT.git
 https://github.com/Init-io/InitJson.git