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

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

docs/configuration/README.md

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+# Configuration Options
+
+This section lists the most common options for running vLLM-Omni.
+
+For options within a vLLM Engine. Please refer to [vLLM Configuration](https://docs.vllm.ai/en/v0.11.0/configuration/index.html)
+
+Currently, the main options are maintained by stage configs for each model.
+
+For specific example, please refer to [Qwen2.5-omni stage config](stage_configs/qwen2_5_omni.yaml)
+
+For introduction, please check [Introduction for stage config](./stage_configs.md)