docs: update root documentation to include vite config file location (#…

…13345)

Co-authored-by: patak <[email protected]>

docs/guide/index.md

@@ -110,6 +110,7 @@ Vite also supports [multi-page apps](./build#multi-page-app) with multiple `.htm
 #### Specifying Alternative Root
 
 Running `vite` starts the dev server using the current working directory as root. You can specify an alternative root with `vite serve some/sub/dir`.
+Note that Vite will also resolve [its config file (i.e. `vite.config.js`)](/config/#configuring-vite) inside the project root, so you'll need to move it if the root is changed.
 
 ## Command Line Interface