docs: add <StarlightPage> import order guidelines

[HiDeoo]

Description

This PR updates the <StarlightPage> component documentation to help with issue 2 in #3162:

After trying many possible workarounds to find a way around what seems to be an unsolvable issue, which depends on how import order works in Astro and also many variables e.g. the number of routes, etc., this PR adds guidelines to the documentation regarding the import order of the <StarlightPage> component and its role in setting up cascade layers.

This first attempt is based on recommendations from Sarah during a Talking & Doc'ing session mentioning the limitations using text and code example comments.

I tried to avoid an aside even tho we use one in the Astro Docs:

Considering how tricky this is, maybe it should be an aside but I wanted to try a first approach without it. Open to any suggestions.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1d35a18

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	1d35a18
🔍 Latest deploy log	https://app.netlify.com/sites/astro-starlight/deploys/68230970b6df6900086c6c58
😎 Deploy Preview	https://deploy-preview-3199--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	guides/pages.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.