docs: add additional example for setting baseURL and cdnURL

[itchina110]

Correct the Example of baseURL and cdnURL

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📚 Description

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[manniL]

Using environment variables to set these values should work and is correct I think 🤔

[danielroe]

The example should be correct. If it is not working for you, would you mind opening an issue with a reproduction? 🙏

[itchina110]

As a beginner with Nuxt, I find the documentation at "Nuxt Configuration" suggesting configuration in the nuxt.config.ts file. However, the examples for baseURL and cdnURL in the documentation are clearly not suitable for nuxt.config.ts. This can be very confusing for beginners. I believe the official documentation should be improved to consider various scenarios and provide clear descriptions.

[danielroe]

Understood! I've updated the PR so it adds an extra example rather than removing the one about overriding at runtime.