refactor: Remove unused libmedia proxy and related files

docs/index.html

@@ -102,10 +102,6 @@
                             <a
                                 href="/?libs=./uncompiled/artplayer-proxy-webav/index.js&example=webav">artplayer-proxy-webav</a>
                         </li>
-                        <li>
-                            <a
-                                href="/?libs=./uncompiled/artplayer-proxy-libmedia/index.js&example=libmedia">artplayer-proxy-libmedia</a>
-                        </li>
                     </ul>
                     <ul>
                         <li class="title">Tools</li>