Adjust www links to point to apk in release

Author: harbaum

www/de/index.html

@@ -148,7 +148,7 @@ <h4>Allgemein</h4>
               <h4>Spezielle Projekte</h4>
               <ul>
 		<li><a href="../../webusb/de">ftDuino-WebUSB-Startseite</a></li>
-		<li><a href="https://harbaum.github.io/ftduino/android/ftDuinoDemo-debug.apk">ftDuino-Android-Demo-App</a></li>
+		<li><a href="https://github.com/harbaum/ftduino/releases/download/0.0.13/ftDuinoDemo-debug.apk">ftDuino-Android-Demo-App</a></li>
 		<li><a href="https://harbaum.github.io/ftduino/minecraft/ftduino-0.0.4.jar">Minecraft-Mod V0.0.4 für Forge 1.12.2</a></li>
 	      </ul>
 

www/en/index.html

@@ -138,7 +138,7 @@ <h4>Generic</h4>
 	    <h4>Special projects</h4>
               <ul>
 		<li><a href="../../webusb/en">ftDuino WebUSB landing page</a></li>
-		<li><a href="https://harbaum.github.io/ftduino/android/ftDuinoDemo-debug.apk">ftDuino Android demo app</a></li>
+		<li><a href="https://github.com/harbaum/ftduino/releases/download/0.0.13/ftDuinoDemo-debug.apk">ftDuino Android demo app</a></li>
 		<li><a href="https://harbaum.github.io/ftduino/minecraft/ftduino-0.0.4.jar">Minecraft mod 0.0.4 for Forge 1.12.2</a></li>
 	      </ul>
               <h4>Sightings</h4>