Add Facebook and email icons

[HiDeoo]

What kind of changes does this PR include?

• Changes or translations of Starlight docs site content
• Changes to Starlight code

Description

• Closes Add Facebook and Email Icons #727.

This pull request adds a Facebook and email icons and includes them in the social icons options.

Note: Unicons does not have a dedicated icon for email but the 2 potential candidates are envelope and at. I picked envelope after searching here and seeing that most icon sets use an envelope for email.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4bfaa44

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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Name	Status	Preview	Updated (UTC)
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[delucis]

LGTM! Thanks @HiDeoo 🙌