What version of starlight are you using?

0.29.2

What version of astro are you using?

4.16.10

What package manager are you using?

npm

What operating system are you using?

linux

What browser are you using?

chrome

Describe the Bug

When favicon configuration parameter contains an absolute url, the generated link in head contains a leading slash.

integrations: [
    starlight({
	favicon: 'https://starlight.astro.build/favicon.svg',

Absolute URLs are valid for favicon so I believe one of the following should be applied:

1. If Starlight requires a local resource, configuration validation should fail if url is not relative
2. Starlight should allow absolute urls and not prefix with leading slash

Link to Minimal Reproducible Example

https://stackblitz.com/edit/withastro-starlight-15r2cj

Participation

• I am willing to submit a pull request for this issue.