Delete duplicated file.

Marlin/src/HAL/HAL_STM32F1/readme.md

@@ -1,32 +0,0 @@
-# This HAL is for STM32F103 boards used with libmaple/stm32duino Arduino core.
-
-# This HAL is in development and has not been tested with an actual printer.
-
-### The stm32 core needs a modification in the file util.h to avoid conflict with Marlin macros for Debug.
-Since only 1 file needs change in the stm32duino core, it's preferable over making changes to Marlin.
-
-
-After these lines:
-<>
-#else
-#define ASSERT_FAULT(exp) (void)((0))
-#endif
-<>
-
-Add the following 3 lines:
-<>
-#undef DEBUG_NONE
-#undef DEBUG_FAULT
-#undef DEBUG_ALL
-<>
-
-### Main developers:
-Victorpv
-
-
-### Most up to date repository for this HAL:
-https://github.com/victorpv/Marlin/tree/bugfix-2.0.x
-
-PRs should be first sent to that fork, and once tested merged to Marlin bugfix-2.0.x branch.
-
-