Feat: Autogenerate sidebar labels

[lorenzolewis]

Description

• Resolves Autogenerate label for sidebar links #1630
• Now using a sidebar entry with the key slug to specify the file will dynamically pull in that file's title
• Update any relevant Starlight docs entries to move their translations out of the config and to the respective content files These will be done in a separate follow-up PR to not trigger i18n

TODOs

• Do the test updates look alright? I added on to the current tests instead of breaking out into a separate one, but can do that if wanted
• Changeset
• Docs updates

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Jul 5, 2024 10:55am

[changeset-bot]

🦋 Changeset detected

Latest commit: 07c0696

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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Lunaria Status Overview

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Tracked Files

Locale	File	Note
en	guides/sidebar.mdx	Source changed, localizations will be marked as outdated.
en	reference/configuration.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[andrii-bodnar]

Wow! Very nice feature, it will greatly improve the DX!

I also faced this and it feels uncomfortable especially when the sidebar contains autogenerated groups and some manually added items. In this case, the autogenerated pages define their sidebar title in the Front Matter section. At the same time, the manual items should define it in the sidebar configuration.

This is also bad for i18n, because the labels for manually added items should be localized separately using the translations configuration.

Waiting for this to ship! 🚀

[lorenzolewis]

LGTM!

[kmalloy24]

I was just looking for this functionality this morning, perfect timing, and great work! Thank you 🙏