replaced some external APIs with ted APIs
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## Summary by CodeRabbit
- **Bug Fixes**
- Removed assertions for `offsetHeight` and `offsetWidth` in the test
case related to a fixed canvas size being visible when height is
selected as Fixed.
- Updated URL references in the test script from "https://randomuser.me"
to "http://host.docker.internal:8000" for image sources.
- Updated API endpoints for two requests in the `API_Bugs_Spec.js` file.
- Updated image URLs in JSON files for fixtures related to widgets in
the client application.
- **Tests**
- Updated API endpoint URLs in test scripts to enhance reliability and
internal consistency.
- Modified image source URLs in various test fixtures to align with
updated internal hosting.
- **Documentation**
- Updated source URLs in iframe configurations to reflect new internal
hosting paths.
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