fix: detect public folder for dead link

[YunYouJun]

For example:

[test](/test.html)

It will check dead link automatically. [test](/test.html) need docs/test.md, otherwise it will fail to build.

But we also can place test.html in docs/public, docs/public/test.html.
So we can add a rule for it. Just check it too.

path.resolve(dir, 'public', `${resolved}.html`)

[antfu]

It's better to use config.publicDir

https://vitejs.dev/config/#publicdir

[YunYouJun]

Yeah, thanks. But i can not find how to use vite config in vitepress.
Can you give me a hint?

[YunYouJun]

How can i get resolvedViteConfig in markdownToVue.ts?
It seems that there is not a global configuration exported.
Should there be a better solution to get some global configuration in the function?

vitepress/src/node/build/bundle.ts

Line 83 in 77f144a

build(resolveViteConfig(false)),

vitepress/src/node/markdownToVue.ts

Line 20 in 77f144a

export function createMarkdownToVueRenderFn(

[antfu]

You can get it using https://vitejs.dev/guide/api-plugin.html#configresolved in plugin.ts and pass it over

[YunYouJun]

Thanks. I submitted a new commit that uses config.publicDir instead of the 'public' string.

[YunYouJun]

@antfu Hello, is there any problem with this PR? Can it be merged?