doc: improve README.md :)

README.md

@@ -1,4 +0,0 @@
-
-The CMake linker line is broken, put this into link.txt
-/opt/local/bin/arm-none-eabi-gcc -g -Wl,-gc-sections,--print-memory-usage,-Map=/Users/heck/src/STM32CubeIDE/workspace1/raw407cxx/cmake-build-debug/raw407cxx.map -mcpu=cortex-m4 -mthumb -mthumb-interwork -T /Users/heck/src/STM32CubeIDE/workspace1/raw407cxx/STM32F407VGTX_FLASH.ld                       CMakeFiles/raw407cxx.elf.dir/Core/Src/main.c.obj CMakeFiles/raw407cxx.elf.dir/Core/Src/stm32f4xx_hal_msp.c.obj CMakeFiles/raw407cxx.elf.dir/Core/Src/stm32f4xx_it.c.obj CMakeFiles/raw407cxx.elf.dir/Core/Src/syscalls.c.obj CMakeFiles/raw407cxx.elf.dir/Core/Src/sysmem.c.obj CMakeFiles/raw407cxx.elf.dir/Core/Src/system_stm32f4xx.c.obj CMakeFiles/raw407cxx.elf.dir/Core/Startup/startup_stm32f407vgtx.s.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cortex.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_dma_ex.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_exti.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ex.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash_ramfunc.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr_ex.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.c.obj CMakeFiles/raw407cxx.elf.dir/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c.obj -o raw407cxx.elf
-NOT needed anymore, tentative fix in `CMakeLists_template.txt`