chore: 删除不再使用的 TypeScript 声明文件，并添加新的插件声明文件

docs/assets/ts/artplayer-plugin-ambilight.d.ts

@@ -0,0 +1,20 @@
+import type Artplayer from 'artplayer';
+
+export = artplayerPluginAmbilight;
+export as namespace artplayerPluginAmbilight;
+
+type Option = {
+    blur: string;
+    opacity: number;
+    frequency: number;
+    zIndex: number;
+    duration: number;
+};
+
+type Result = {
+    name: 'artplayerPluginAmbilight';
+    start: () => void;
+    stop: () => void;
+};
+
+declare const artplayerPluginAmbilight: (option: Option) => (art: Artplayer) => Result;