refactor: use window.location as base for url construction

[fkakatie]

Replaces instances of creating URL objects with a single argument with the two-argument form, using window.location as the base URL. Ensures that relative URLs are resolved against the current browser location for consistent handling.

Test URLs:

• Before: https://main--aem-boilerplate--adobe.hlx.live/
• After: https://relative-paths--aem-boilerplate--adobe.hlx.live/

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[buuhuu]

@fkakatie this has now been done with #346