Remove deprecated cache.appcache and related references #4730
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Fixes: #4665
Summary
This PR removes the deprecated cache.appcache file and its references in HTML. AppCache is an obsolete feature that is no longer supported in modern browsers due to significant security and performance issues.
We have already migrated to a Service Worker-based solution (sw.js) for offline functionality, making the AppCache file redundant.
References
Checklist