docs: update readme links

Signed-off-by: Sean Sheng <[email protected]>

README.md

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 <div align="center">
     <h1 align="center">🦾 OpenLLM: Self-Hosting LLMs Made Easy</h1>
-    <a href="https://pypi.org/project/openllm">
-        <img src="https://img.shields.io/pypi/v/openllm.svg?logo=pypi&label=PyPI&logoColor=gold" alt="pypi_status" />
-    </a><a href="https://results.pre-commit.ci/latest/github/bentoml/OpenLLM/main">
-        <img src="https://results.pre-commit.ci/badge/github/bentoml/OpenLLM/main.svg" alt="pre-commit.ci status" />
-    </a><br><a href="https://twitter.com/bentomlai">
-        <img src="https://badgen.net/badge/icon/@bentomlai/1DA1F2?icon=twitter&label=Follow%20Us" alt="Twitter" />
-    </a><a href="https://l.bentoml.com/join-openllm-discord">
-        <img src="https://badgen.net/badge/icon/OpenLLM/7289da?icon=discord&label=Join%20Us" alt="Discord" />
-    </a>
 </div>
 
+[![License: Apache-2.0](https://img.shields.io/badge/License-Apache%202-green.svg)](https://github.com/bentoml/OpenLLM/blob/main/LICENSE)
+[![Releases](https://img.shields.io/pypi/v/openllm.svg?logo=pypi&label=PyPI&logoColor=gold)](https://pypi.org/project/openllm)
+[![CI](https://results.pre-commit.ci/badge/github/bentoml/OpenLLM/main.svg)](https://results.pre-commit.ci/latest/github/bentoml/OpenLLM/main)
+[![X](https://badgen.net/badge/icon/@bentomlai/000000?icon=twitter&label=Follow)](https://twitter.com/bentomlai)
+[![Community](https://badgen.net/badge/icon/Community/562f5d?icon=slack&label=Join)](https://l.bentoml.com/join-slack)
+
 ## Introduction
 
 OpenLLM lets developers run any **open-source LLMs** as **OpenAI-compatible API** endpoints with **a single command**.