Fix: Remove duplicate demo.launch() and syntax errors

app.py

@@ -391,8 +391,4 @@ with gr.Blocks(title="CUDA ML Kernels", theme=gr.themes.Soft(primary_hue="orange
     Built with ❤️ for GPU optimization. Running on **Nvidia RTX Pro 6000** with real-time benchmarks.
     """)
 
-demo.launch()
-    
-    gr.Markdown("### [GitHub](https://github.com/data-geek-astronomy/cuda-ml-kernels)")
-
 demo.launch()