Add test to verify repository homepage URL availability

[MariusStorhaug]

Context

Repositories using Process-PSModule have a configured homepage URL pointing to their GitHub Pages documentation site. If the Pages site goes down or the URL becomes invalid, there is no automated check to detect this.

Request

A test or CI check should verify that the repository's configured homepage URL is reachable and returns a successful HTTP status.

Acceptance criteria

• The homepage URL configured on the repository is tested for availability
• A non-200 response or connection failure is reported as a test failure or warning
• The check runs as part of the CI pipeline or a scheduled workflow

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Technical decisions

To be determined during implementation planning.

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Implementation plan

• Determine where to add the availability check (Test-PSModule, CI workflow, or scheduled job)
• Implement an HTTP request to the repository homepage URL
• Validate the response status code (expect 200)
• Report failures or warnings appropriately

[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
• Created implementation plan with 4 tasks
• Applied Patch label