let f-droid.org show the right language to the user

The old URL forces the page language to German e,g, `de`.  Removing the locale makes f-droid.org show the language that the browser is using.

docs/index.html

@@ -40,7 +40,7 @@
 				class="w-36 pr-2 mb-2 inline hover:scale-105 transition-transform"></a>
 		<a href="https://play.google.com/store/apps/details?id=chat.fluffy.fluffychat"><img src="google-play-badge.png"
 				class="w-36 pr-2 mb-2  hover:scale-105 transition-transform inline">
-		</a><a href="https://f-droid.org/de/packages/chat.fluffy.fluffychat/"><img src="fdroid_button.png"
+		</a><a href="https://f-droid.org/packages/chat.fluffy.fluffychat/"><img src="fdroid_button.png"
 				class="w-36 pr-2 mb-2  hover:scale-105 transition-transform inline">
 		</a>
 		<a href="https://fluffychat.im/web">
@@ -116,4 +116,4 @@
 
 </body>
 
-</html>
+</html>