Remove reference to NRF Softdevice in CMake and documentation.

Update documentation.
Remove Asserts when starting advertising to prevent crash (known bug).
Set version 0.5.0.

src/main.cpp

@@ -195,7 +195,6 @@ void nimble_port_init(void) {
 }
 
 void nimble_port_ll_task_func(void *args) {
-//  extern void ble_ll_task(void *arg);
   ble_ll_task(args);
 }
 }