docs: add gitpod link for readme (#6876)

#### What type of PR is this?

/kind documentation

#### What this PR does / why we need it:

添加 Gitpod 的演示环境链接。

#### Does this PR introduce a user-facing change?

```release-note
None 
```
This commit is contained in:
Ryan Wang 2024-10-16 14:07:27 +08:00 committed by GitHub
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@ -27,10 +27,16 @@
## 快速开始
如果你的设备有 Docker 环境,可以使用以下命令快速启动一个 Halo 的体验环境:
```bash
docker run -d --name halo -p 8090:8090 -v ~/.halo2:/root/.halo2 halohub/halo:2.20
```
或者点击下方按钮使用 [Gitpod](https://gitpod.io/) 启动一个体验环境:
[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/halo-sigs/gitpod-demo)
以上仅作为体验使用,详细部署文档请查阅:<https://docs.halo.run/getting-started/install/docker-compose>
## 在线体验