feat(astro): Add support for custom pages and links

[wobsoriano]

Description

This PR adds support for custom pages and links in the <UserProfile /> Astro component. It implements the same behavior with the React counterpart:

Closes ECO-23

Usage:

<UserProfile>
    <!-- Custom page -->
    <UserProfile.Page label="Terms" url="terms">
        <div slot="label-icon">Icon</div>
        <div>
            <h1>Custom Terms Page</h1>
            <p>This is the custom terms page</p>
        </div>
    </UserProfile.Page>
    <!-- Custom link -->
    <UserProfile.Link label="Homepage" url="/">
        <div slot="label-icon">Home</div>
    </UserProfile.Link>
    <!-- Reorder default item -->
    <UserProfile.Page label="security" />
</UserProfile>

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 5b7b957

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

This PR includes changesets to release 1 package

Name	Type
@clerk/astro	Minor

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[panteliselef]

💯

[anagstef]

Nice work! 💯