Strip leading and trailing slashes from autogenerate.directory

[HiDeoo]

What kind of changes does this PR include?

• Changes to Starlight code

Description

For sidebar autogenerated groups, we expect the autogenerate.directory to not include leading or trailing slashes:

starlight/packages/starlight/utils/navigation.ts

Lines 90 to 97 in 01190b3

	const localeDir = locale ? locale + '/' + directory : directory;
	const dirDocs = routes.filter(
	(doc) =>
	// Match against `foo.md` or `foo/index.md`.
	stripExtension(doc.id) === localeDir ||
	// Match against `foo/anything/else.md`.
	doc.id.startsWith(localeDir + '/')
	);

This can lead to empty groups in the sidebar if the user has a leading or trailing slash in their autogenerate.directory and no real hint or error message as to why like this Discord message.

This pull request suggests that we strip leading and trailing slashes from autogenerate.directory in the Zod schema using a .transform().

Note: I also updated some invalid paths in various mockedAstroContent() test calls following the rename of reference/configuration.md to reference/configuration.mdx in #869.

[changeset-bot]

🦋 Changeset detected

Latest commit: 998cde0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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[delucis]

Thanks @HiDeoo! Tried to think through if there are any drawbacks to supporting directory containing slashes, but I can’t think of any, so this seems like a good solution. Thanks for putting it together!