refactor: delete unused .d.ts

webrtc-adapter has typings on npm

webrtc-adapter.d.ts

@@ -1,21 +0,0 @@
-declare module "webrtc-adapter" {
-	interface BrowserDetails {
-		browser:
-			| "Not a browser."
-			| "Not a supported browser."
-			| "firefox"
-			| "chrome"
-			| "safari"
-			| "edge";
-		version: number | null;
-		supportsUnifiedPlan?: boolean;
-	}
-
-	interface Adapter {
-		browserDetails: BrowserDetails;
-	}
-
-	var adapter: Adapter;
-
-	export default adapter;
-}