update readme

catkin_ws/src/uwb_delay_calibration/README.md

@@ -56,8 +56,6 @@ On each UWB, turn on S1-4, apply power, and note the `TX DELAY` and `RX DELAY` a
 
 Configure the switches S1 5-6-7 as desired on all 3 UWBs and setup two of them a fixed distance apart, antenna faces toward each other. See the following table for the appropraite distance for each S1 switch configuration. 
 
-<img src="img/UWB setup.png" width="480">
-
 
 | S1 5-6-7     | Distance [m]  |
 | ------------ | ------------- |