Layout refactoring

[delucis]

What kind of changes does this PR include?

• Changes to Starlight code

Description

• Working on refactoring the page layout to support disabling the table of contents and “splash” pages without any navigation
• Moved the “edit page” link to the page footer so it doesn’t vanish if there’s no ToC/on mobile screens

[changeset-bot]

🦋 Changeset detected

Latest commit: a0f15d4

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

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[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	9.53 KB (-11.4% 🔽)
/_astro/*.js	16.51 KB (+0.11% 🔺)
/_astro/*.css	9.1 KB (+2.51% 🔺)