add datasheets for SK6812RGBX parts under doc/

- plan to make 24-bit/32-bit selectable, at least at compile-time
- FX are mostly broken since they mostly assume RGB
	- tested static & blink

README.md

@@ -15,7 +15,6 @@ The FX library is based od WS2812FX Arduino librarby by kitesurfer1404 - https:/
 Clone this repository, or add it as a submodule, to your STM32 project under the Drivers/ directory.
 
 Example:
-In main.c:
 ```
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
@@ -31,22 +30,3 @@ int main(void)
 	/* USER CODE END 2 */
 }
 ```
-
-In your interrupt service routines:
-```
-/* USER CODE BEGIN Includes */
-#include "ws2812b.h"
-#include "ws2812b_fx.h"
-/* USER CODE END Includes */
-...
-void SysTick_Handler(void)
-{
-  /* USER CODE BEGIN SysTick_IRQn 0 */
-
-  /* USER CODE END SysTick_IRQn 0 */
-  HAL_IncTick();
-  /* USER CODE BEGIN SysTick_IRQn 1 */
-  WS2812BFX_SysTickCallback();
-  /* USER CODE END SysTick_IRQn 1 */
-}
-```