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

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

docs/community/contact_us.md

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+# Contact Us
+
+- For technical questions and feature requests, please use GitHub [Issues](https://github.com/vllm-project/vllm-omni/issues)
+- 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

docs/community/meetups.md

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+# Meetups