[Cherry-pick][Doc] Remove NVIDIATensorRT doc (#8973)

Author: csy0225

docs/index.rst

@@ -87,7 +87,6 @@ Welcome to Paddle-Lite's documentation!
   demo_guides/bitmain
   demo_guides/intel_fpga
   demo_guides/intel_openvino
-  demo_guides/nvidia_tensorrt
 
 .. toctree::
   :maxdepth: 1