Allow overriding Pagefind bundlePath in Starlight

[lawvs]

When deploying under a subpath (e.g., GitHub Pages project site), the search client requests Pagefind assets from /pagefind/... instead of /<project_name>/pagefind/. Example: https://www.waterwater.moe/fn-sphere/

Setting BASE_URL can fix this, but exposing bundlePath to the PagefindOptions would make Starlight more robust for varied hosting setups.

starlight/packages/starlight/components/Search.astro

Lines 142 to 145 in 5787485

	...pagefindUserConfig,
	element: '#starlight__search',
	baseUrl: import.meta.env.BASE_URL,
	bundlePath: import.meta.env.BASE_URL.replace(/\/$/, '') + '/pagefind/',

[delucis]

Hi @lawvs! This is our bug tracker, so I’ll convert this to a feature request discussion.

We respect the base set in the Astro configuration which should address the use case you described. For example, here’s a site I host on GitHub Pages: https://delucis.github.io/starlight-theme-flexoki/

But I’d be curious to hear more about the use cases that aren’t covered by that.

[lawvs]

Thank you very much for your response; the base configuration can effectively resolve this issue.

Yet, I prefer the configuration of relative paths because it lets me avoid rewriting links with the subpath and keep the docs portable. Adding base forced me to rewrite internal Markdown links (see lawvs/fn-sphere@1f4a223) to include the subpath, which is noisy and error‑prone if the base ever changes.