Link in html files are wrong for routes when using adapter-static

[myhrmans]

Describe the bug

When building using adapter-static and going to the output folder to check the index.html files you can see that the links
`

	<link rel="modulepreload" href="/_app/chunks/vendor-3d58c1d9.js">

	<link rel="modulepreload" href="/_app/chunks/preload-helper-ec9aa979.js">

	<link rel="modulepreload" href="/_app/chunks/singletons-ff603286.js">

	<link rel="stylesheet" href="/_app/assets/start-61d1577b.css">`

or in this case; the entire file is identical.
The links are relative but when creating routes they should be relative to where the index files are stored.

the viewed file in the below image is /_app/home/prototype/index.html but the links in it refer to /_app... but should be ../../../_app

Opening one of these index files will result in a "FILE_NOT_FOUND"

Reproduction

https://github.com/myhrmans/sveltekit-link-generation-bug

Logs

No response

System Info

System:
    OS: Linux 5.11 Ubuntu 20.04.3 LTS (Focal Fossa)
    CPU: (8) x64 Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
    Memory: 440.27 MB / 31.28 GB
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 16.13.0 - ~/.nvm/versions/node/v16.13.0/bin/node
    Yarn: 1.22.10 - /usr/bin/yarn
    npm: 8.1.0 - ~/.nvm/versions/node/v16.13.0/bin/npm
  Browsers:
    Chrome: 96.0.4664.93
    Chromium: 96.0.4664.45
    Firefox: 95.0

Severity

blocking all usage of SvelteKit

Additional Information

No response

[iacore]

You were using file:// transport, which is platform-dependent. You are not supposed to visit a website from disk. Run a HTTP server and visit the website that way. python -m http.server is a simple HTTP server.

[myhrmans]

Wrong button...

[Rich-Harris]

Closing, as SvelteKit uses relative links in all cases except an explicit paths.asset or fallback prerendering, so this should work even with file:// URLs