Delete unused files

docs/assets/ts/artplayer-plugin-multiple-subtitles.d.ts

@@ -0,0 +1,16 @@
+import type Artplayer from 'artplayer';
+
+export = artplayerPluginMultipleSubtitles;
+export as namespace artplayerPluginMultipleSubtitles;
+
+declare const artplayerPluginMultipleSubtitles: (option: {
+    subtitles: {
+        url?: string;
+        name?: string;
+        type?: 'vtt' | 'srt' | 'ass';
+        encoding?: string;
+        onParser?(...args: object[]): object;
+    }[];
+}) => (art: Artplayer) => {
+    name: 'multipleSubtitles';
+};