Delete firmware/MeshCore v1.12.0 - HotFixes directory

firmware/MeshCore v1.12.0 - HotFixes/_Hot-fix notes.txt

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-Hot fixes for MeshCore v1.12.0
-- Heltec v4: Fixed to cut power of OLED when OLED is off to save 26mA.
-https://github.com/meshcore-dev/MeshCore/issues/1558
-https://github.com/meshcore-dev/MeshCore/pull/1569
-
-- Heltec v4: Fixed to support UART console to view console and flash without pressing PRG+RST.
-https://github.com/meshcore-dev/MeshCore/pull/1335
-
-- TBeam SX1262: Fixed and added missing companion firmware due to insufficient DRAM.
-https://github.com/meshcore-dev/MeshCore/issues/1526
-
-Notes: 
-- Provided by IoTThinks.com for community
-- No warranty is provided. You can test and feedback.
-- Instruction to upgrade custom firmware: https://github.com/IoTThinks/EasySkyMesh/blob/main/firmware/Instruction-to-flash-firmware.md