Starlight-GhostCMS: Add 2 new pages, and social icons

[Adammatthiesen]

Just a quick patch to add the following

• About page that will turn on if a GhostCMS page with the slug "about" is available (This is true in any default Ghost install)
• Add Authors page
• Adds Twitter & Facebook social icons from ghost to Starlight if not filled by user in Starlight config

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: cb979d5b0ffba074be33ae5cdb88ec5f897e21ac

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | --------------------------------- | ----- | | @matthiesenxyz/starlight-ghostcms | Patch |

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