update docs/readme.md and design folder (#234)

Signed-off-by: hsliu <liuhongsheng4@huawei.com>

docs/design/feature/omni_connector_design.md

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+## OmniConnector for fully disaggregated serving (update soon)

docs/design/index.md

@@ -6,4 +6,14 @@ This section contains design documents and architecture specifications for vLLM-
 
 - [Architecture Overview](architecture_overview.md)
 - [vLLM-Omni Software Design Document](vllm_omni_design.md)
-- [Multi-Request Streaming](mrs_design.md)
+
+## Feature Design Documents
+
+- [Multi-Request Streaming](feature/multi_request_streaming_design.md)
+- [Omni Connector Design](feature/omni_connector_design.md)
+
+## Module Design Documents
+
+- [AR Module Design](module/ar_module_design.md)
+- [DIT Module Design](module/dit_module_design.md)
+- [Entrypoint Module Design](module/entrypoint_module_design.md)

docs/design/module/ar_module_design.md

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+Architecture design of the AR module (update soon)

docs/design/module/dit_module_design.md

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+Architecture design of the DiT module (update soon)

docs/design/module/entrypoint_module_design.md

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+Architecture design of the entrypoint (update soon)