(#1357) Upgrade to Astro 7

[st3phhays]

Description Of Changes

• Upgrades Astro to version 7
• Upgrades transient dependencies

Motivation and Context

We want to take advantage of the latest fixes and features in Astro 7.

Testing

• I have previewed these changes using the Docker Container or another method before submitting this pull request.

Change Types Made

• Minor documentation fix (typos etc.).
• Major documentation change (refactoring, reformatting or adding documentation to existing page).
• New documentation page added.
• The change I have made should have a video added, and I have raised an issue for this.
  • Issue #

Change Checklist

• Requires a change to menu structure (top or left-hand side)/
• Menu structure has been updated
• Images added to the img repository?
  • PR -
• All items are complete on the Definition of Done.

Related Issue

• Upgrade to Astro v7+ #1357
• PROJ-2998