Remove (almost) all <audio> tags

Not sure what `remoteAudio` does, seems only used in tests,
so I left it there.

src/vector/index.html

@@ -73,26 +73,6 @@
     <img src="<%= require('matrix-react-sdk/res/img/format/quote.svg').default %>" aria-hidden alt="" width="25" height="22" style="visibility: hidden; position: absolute; top: 0px; left: 0px;"/>
     <img src="<%= require('matrix-react-sdk/res/img/format/strikethrough.svg').default %>" aria-hidden alt="" width="25" height="22" style="visibility: hidden; position: absolute; top: 0px; left: 0px;"/>
 
-    <audio id="ringAudio" loop>
-        <source src="media/ring.ogg" type="audio/ogg" />
-        <source src="media/ring.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="ringbackAudio" loop>
-        <source src="media/ringback.ogg" type="audio/ogg" />
-        <source src="media/ringback.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="callendAudio">
-        <source src="media/callend.ogg" type="audio/ogg" />
-        <source src="media/callend.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="busyAudio">
-        <source src="media/busy.ogg" type="audio/ogg" />
-        <source src="media/busy.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="errorAudio">
-        <source src="media/error.ogg" type="audio/ogg" />
-        <source src="media/error.mp3" type="audio/mpeg" />
-    </audio>
     <audio id="remoteAudio"></audio>
     <!-- let CSS themes pass constants to the app -->
     <div id="mx_theme_accentColor"></div><div id="mx_theme_secondaryAccentColor"></div><div id="mx_theme_tertiaryAccentColor"></div>