Update installer.html (#3442)

change url for media players

Co-authored-by: H. Árkosi Róbert <[email protected]>

Author: Misiu

projects/installer.html

@@ -543,7 +543,7 @@ <h3>For advanced users</h3>
     </li>
     <li>
       The YAML configuration is on
-      <a href="https://github.com/esphome/firmware/tree/main/bluetooth-proxy">GitHub</a>
+      <a href="https://github.com/esphome/firmware/tree/main/bluetooth-proxy/">GitHub</a>
     </li>
   </ul>
 </div>
@@ -711,7 +711,7 @@ <h3>For advanced users</h3>
     </li>
     <li>
       The YAML configuration is on
-      <a href="https://github.com/esphome/media-players/">GitHub</a>
+      <a href="https://github.com/esphome/firmware/tree/main/media-player/">GitHub</a>
     </li>
   </ul>
 </div>