Move site title href to route data for easier overrides

[delucis]

Description

• Currently <SiteTitle> calculates the value of its link internally. This makes it tricky for people to set the link while reusing the default component implemenation.
• This PR adds a siteTitleHref property to the route data object (and the one for StarlightPage), moving the logic for working out the link path there.
• This means in an override you can set Astro.props.siteTitleHref = '/custom-link/' if you need and still use the default component implementation.

Considerations

• This is still more complex than adding a dedicated Starlight option for the site title link. Should we consider that? There’s a bit of complexity due to how this intersects with i18n locales, so not 100% what a good config would look like.
• I’ve named the new prop siteTitleHref for now, but it could also be something more generic like homeLink I guess?

[vercel]

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	May 14, 2024 10:20pm

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Name	Status	Preview	Updated (UTC)
starlight-i18n	⬜️ Ignored (Inspect)		May 14, 2024 10:20pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 73ad8e5

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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[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	6.1 KB (0%)
/_astro/*.js	22.02 KB (0%)
/_astro/*.css	13.45 KB (0%)

[astrobot-houston]

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Warnings reference

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🔄️	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.

[wpplumber]

Welcome,

Does this got a confirmation and will be published soon?

[HiDeoo]

Just tried it out and it works perfectly 🙌