Update Google Play link in index.html

Author: eried

docs/index.html

@@ -109,7 +109,7 @@
     <h1><a href="https://eucplanet.ried.no">EUC Planet</a></h1>
     <p class="tagline">A no-nonsense, open-source app for electric unicycles.</p>
     <div class="links">
-      <a class="btn btn-play" href="https://play.google.com/apps/testing/com.eried.eucplanet" aria-label="Get it on Google Play">
+      <a class="btn btn-play" href="https://play.google.com/store/apps/details?id=com.eried.eucplanet" aria-label="Get it on Google Play">
         <img src="https://play.google.com/intl/en_us/badges/static/images/badges/en_badge_web_generic.png" alt="Get it on Google Play">
       </a>
       <a class="btn" href="https://github.com/eried/eucplanet/releases">Download APK</a>