[Docs] optimize and supplement docs system (#86)

Signed-off-by: Gaohan123 <gaohan19@huawei.com>

docs/getting_started/installation/gpu.md

@@ -0,0 +1,49 @@
+# GPU
+
+vLLM-Omni is a Python library that supports the following GPU variants. Select your GPU type to see vendor specific instructions:
+
+[](){ #nvidia-cuda }
+
+=== "NVIDIA CUDA"
+
+    --8<-- "docs/getting_started/installation/gpu/cuda.inc.md:installation"
+
+## Requirements
+
+- OS: Linux
+- Python: 3.12
+
+!!! note
+    vLLM-Omni does not support Windows natively.
+
+=== "NVIDIA CUDA"
+
+    --8<-- "docs/getting_started/installation/gpu/cuda.inc.md:requirements"
+
+## Set up using Python
+
+### Create a new Python environment
+
+--8<-- "docs/getting_started/installation/python_env_setup.inc.md"
+
+=== "NVIDIA CUDA"
+
+    --8<-- "docs/getting_started/installation/gpu/cuda.inc.md:set-up-using-python"
+
+### Pre-built wheels
+
+=== "NVIDIA CUDA"
+
+    --8<-- "docs/getting_started/installation/gpu/cuda.inc.md:pre-built-wheels"
+
+[](){ #build-from-source }
+
+### Build wheel from source
+
+=== "NVIDIA CUDA"
+
+    --8<-- "docs/getting_started/installation/gpu/cuda.inc.md:build-wheel-from-source"
+
+## Set up using Docker
+
+### Pre-built images