Move tuning files into vc4 folder in case we support pisp (Pi5) later and update README

src/openflexure_microscope_server/things/camera/picamera.py

@@ -766,6 +766,7 @@ class StreamingPiCamera2(BaseCamera):
             with self._streaming_picamera(pause_stream=True):
                 self._initialise_picamera()
 
+    # TODO make reset CCM reset from default tuning.
     @lt.thing_action
     def reset_ccm(self) -> None:
         """Overwrite the colour correction matrix in camera tuning with default values.