[doc] use snippets for contact us (#19944)

Signed-off-by: reidliu41 <reid201711@gmail.com>
Co-authored-by: reidliu41 <reid201711@gmail.com>

README.md

@@ -154,12 +154,13 @@ If you use vLLM for your research, please cite our [paper](https://arxiv.org/abs
 
 ## Contact Us
 
+<!-- --8<-- [start:contact-us] -->
 - For technical questions and feature requests, please use GitHub [Issues](https://github.com/vllm-project/vllm/issues) or [Discussions](https://github.com/vllm-project/vllm/discussions)
 - For discussing with fellow users, please use the [vLLM Forum](https://discuss.vllm.ai)
 - For coordinating contributions and development, please use [Slack](https://slack.vllm.ai)
 - For security disclosures, please use GitHub's [Security Advisories](https://github.com/vllm-project/vllm/security/advisories) feature
 - For collaborations and partnerships, please contact us at [vllm-questions@lists.berkeley.edu](mailto:vllm-questions@lists.berkeley.edu)
-<!-- Please keep this section up to date with vllm/docs/community/contact_us.md. -->
+<!-- --8<-- [end:contact-us] -->
 
 ## Media Kit
 

docs/community/contact_us.md

@@ -3,9 +3,4 @@ title: Contact Us
 ---
 [](){ #contactus }
 
-- For technical questions and feature requests, please use GitHub [Issues](https://github.com/vllm-project/vllm/issues) or [Discussions](https://github.com/vllm-project/vllm/discussions)
-- For discussing with fellow users, please use the [vLLM Forum](https://discuss.vllm.ai)
-- For coordinating contributions and development, please use [Slack](https://slack.vllm.ai)
-- For security disclosures, please use GitHub's [Security Advisories](https://github.com/vllm-project/vllm/security/advisories) feature
-- For collaborations and partnerships, please contact us at [vllm-questions@lists.berkeley.edu](mailto:vllm-questions@lists.berkeley.edu)
-<!-- Please keep this file up to date with the "Contact Us" section in vllm/README.md. -->
+--8<-- "README.md:contact-us"