Add test to verify repository homepage matches GitHub Pages URL

[MariusStorhaug]

Context

Repositories using Process-PSModule should have their GitHub repository homepage field set to their GitHub Pages URL so users can easily discover the documentation site.

Request

A test should verify that the repository's homepage field matches its GitHub Pages URL.

Acceptance criteria

• The test retrieves both the repository homepage and the Pages URL
• The test asserts that the homepage matches the Pages URL
• Mismatches are flagged as a test failure or warning
• The test handles cases where Pages is not configured

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Technical decisions

To be determined during implementation planning — uses the GitHub Repository API and Pages API.

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Implementation plan

• Implement a test that retrieves the repository's homepage field
• Retrieve the GitHub Pages URL from the Pages API
• Compare the two and assert they match
• Handle edge cases (Pages not configured, homepage not set)

[MariusStorhaug]

Restructured issue description into the standard three-section format.

• Rewrote from a one-line description into a proper context/request structure
• Updated title to imperative mood (removed emoji prefix)
• Added acceptance criteria and links to relevant GitHub APIs
• Created implementation plan with 4 tasks
• Applied Patch label