Reorg folders and use core as ffmpeg from now on

apps/node-ts/ffmpeg/help.ts

@@ -0,0 +1,7 @@
+import createFFmpeg from "@ffmpeg/ffmpeg";
+
+void (async () => {
+  const ffmpeg = await createFFmpeg();
+  ffmpeg.setLogger(({ message }) => console.log(message));
+  console.log("return code: ", ffmpeg.exec(["-h"]));
+})();