Update ecg_kit_assembly.md

en/ecg_kit_assembly.md

@@ -8,25 +8,25 @@ Stick some insulating tape over the ECG contacts at the bottom of your wristband
 
 Cut off the USB-A connector as we don't have use for it
 
-<img class="center" alt="cut usb wire" src="/media/ecg/1-cut-wire.jpg"  width="300" height="auto" align="center">
+![cut usb wire](/media/ecg/1-cut-wire.jpg)
 
 Slide the big shrinking tube over the USB cable
 
 Separate the wires as shown in the picture
 
-<img class="center" alt="usb wire meanings" src="/media/ecg/wire-meanings.jpg"  width="300" height="auto" align="center">
+![usb wire meanings](/media/ecg/wire-meanings.jpg)
 
 
 Cut off all wires ecxept for orange and purple
 
-<img class="center" alt="cut off unused wires" src="/media/ecg/cut-off-wires.jpg"  width="300" height="auto" align="center">
+![cut off unused wires](/media/ecg/cut-off-wires.jpg)
 
 
 Move the two small shrinking tubes over the ECG wires
 
 Solder the ECG wires to the USB wires as shown in the pictures
 
-<img class="center" alt="solder ecg usb wires" src="/media/ecg/3-solder.jpg"  width="300" height="auto" align="center">
+![solder ecg usb wires](/media/ecg/3-solder.jpg)
 
 
 
@@ -34,26 +34,26 @@ Test your ECG setup on your Card10 prior the next step
 
 Slide the small shrinking tubes over the soldering connections and apply hot air (e.g. lighter)
 
-<img class="center" alt="apply small heat shrink tubes" src="/media/ecg/4-add-heat-shrink.jpg"  width="300" height="auto" align="center">
+![apply small heat shrink tubes](/media/ecg/4-add-heat-shrink.jpg)
 
-<img class="center" alt="shrink small heat shrink tubes" src="/media/ecg/5-shrik-this.jpg"  width="300" height="auto" align="center">
+![shrink small heat shrink tubes](/media/ecg/5-shrik-this.jpg)
 
 
 
 Slide the bigger shrinking tube over the two small ones and also shrink it
 
-<img class="center" alt="apply large heat shrink tube" src="/media/ecg/large-heat-shrink.jpg"  width="300" height="auto" align="center">
+![apply large heat shrink tube](/media/ecg/large-heat-shrink.jpg)
 
 
 Have fun and hack ECG stuff
 
-<img class="center" alt="ecg fertig" src="/media/ecg/fertig.jpg"  width="300" height="auto" align="center">
+![ecg fertig](/media/ecg/fertig.jpg)
 
 
 
 ### Usage
 
-<img class="center" alt="ecg usage" src="/media/ecg/application.jpg"  width="300" height="auto" align="center">
+![ecg usage](/media/ecg/application.jpg)
 
 
 #### ECG