feat: add CourseCard Link in CourseList component

[22Xy]

• As described in issue enhancement: 课程卡片链接 #117, add CourseCard Link in CourseList component

• Add REACT_APP_API_URL in build script for a local working preview build.

[vercel]

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[22Xy]

@AmazingAng @chongqiangchen could you review this pull request? Thank you!

[chongqiangchen]

1. 我push了一个.env.sample和增加了cp .env.sample .env的提示帮助本地项目的运行，替代了Add REACT_APP_API_URL in build script for a local working preview build这个需求，因为线上由vercel env增加的环境值
2. Link to的链接可能是外部链接(https://xxxx.com/course_path),这也是当时开发者这样写的原因， 可能需要调整一下，格式化routepath后给到link to合适一些

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 14, 2024 8:47am

[22Xy]

1. 我push了一个.env.sample和增加了cp .env.sample .env的提示帮助本地项目的运行，替代了Add REACT_APP_API_URL in build script for a local working preview build这个需求，因为线上由vercel env增加的环境值

2. Link to的链接可能是外部链接(https://xxxx.com/course_path),这也是当时开发者这样写的原因， 可能需要调整一下，格式化routepath后给到link to合适一些

好的我修改一下👌🏼

[22Xy]

根据@chongqiangchen 建议修改了一下代码：7ed803d

内部路径：

外部链接：

删除了build script中的 REACT_APP_API_URL