Add Astro 5 banner to docs homepage

[delucis]

Description

Adds a link to the 0.30 release notes to the Starlight homepage to help discoverability for that upgrade guidance for those who need it.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5f2d66e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[netlify]

✅ Deploy Preview for astro-starlight ready!

Name	Link
🔨 Latest commit	5f2d66e
🔍 Latest deploy log	https://app.netlify.com/sites/astro-starlight/deploys/675cc8bec06cf100083ea211
😎 Deploy Preview	https://deploy-preview-2671--astro-starlight.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 100 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[astrobot-houston]

Lunaria Status Overview

🌕 This pull request will trigger status changes.

Learn more

By default, every PR changing files present in the Lunaria configuration's files property will be considered and trigger status changes accordingly.

You can change this by adding one of the keywords present in the ignoreKeywords property in your Lunaria configuration file in the PR's title (ignoring all files) or by including a tracker directive in the merged commit's description.

Tracked Files

Locale	File	Note
en	index.mdx	Source changed, localizations will be marked as outdated.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.

[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	6.93 KB (0%)
/_astro/*.js	21.19 KB (0%)
/_astro/*.css	13.74 KB (0%)

[TheOtterlord]

🥳