Update Dockerfile to use ytplaylist.cli as entry point and clean up yt-playlist-main.py

Dockerfile

@@ -7,4 +7,4 @@ COPY ./bin/ffmpeg /app/bin
 COPY ./bin/yt-dlp /app/bin
 COPY ./bin/aria2c /app/bin
 
-CMD ["python", "yt-playlist-main.py"]
+CMD ["python","-m","ytplaylist.cli"]

yt-playlist-main.py

@@ -15,4 +15,3 @@ if __name__ == "__main__":
             pass
 
     main()
-