Move ESP-IDF HAL back to examples (#1322)

examples/NonArduino/ESP-IDF/main/EspHal.h

@@ -7,7 +7,7 @@
 // this example only works on ESP32 and is unlikely to work on ESP32S2/S3 etc.
 // if you need high portability, you should probably use Arduino anyway ...
 #if CONFIG_IDF_TARGET_ESP32 == 0
-  #error Target is not ESP32!
+  #error This example HAL only supports ESP32 targets. Support for ESP32S2/S3 etc. can be added by adjusting this file to user needs.
 #endif
 
 // include all the dependencies

examples/NonArduino/ESP-IDF/main/main.cpp

@@ -17,7 +17,7 @@
 #include <RadioLib.h>
 
 // include the hardware abstraction layer
-#include "hal/ESP-IDF/EspHal.h"
+#include "EspHal.h"
 
 // create a new instance of the HAL class
 EspHal* hal = new EspHal(5, 19, 27);