Pin Astro to 2.7.0 to avoid new users hitting CSS HMR bugs

[delucis]

What kind of changes does this PR include?

• Something else!

Description

#301 bumped Astro in the starter template and dev dependencies to 2.7.3, but versions ≥2.7.1 have a dev bug with CSS and HMR (see withastro/astro#7529)

This PR pins those back down to 2.7.0 where that’s not an issue to ensure a smooth dev experience in this repo and for new Starlight users trying things out.

No Starlight release or changeset needed as this is purely for local dev dependencies and for people cloning the starter template.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5509907

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.

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[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	13.16 KB (0%)
/_astro/*.js	16.22 KB (0%)
/_astro/*.css	8.46 KB (0%)