Rework 'Parse JSON from API' example

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Preview the game(s) changed or added in this Pull Request

• https://editor.gdevelop.io?project=https://raw.githubusercontent.com/GDevelopApp/GDevelop-examples/refactor/parse-json-from-api/examples/parse-json-from-api/parse-json-from-api.json

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This is an automatic message displaying links to the games in this PR - double check the JSON in case of doubt.

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Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 77.8%, saving 20.9 KB.

Filename	Before	After	Improvement	Visual comparison
examples/parse-json-from-api/assets/Orange Bubble Button_Pressed.png	8.9 KB	1.9 KB	79.0%	View diff
examples/parse-json-from-api/assets/Orange Bubble Button_Hovered.png	9.0 KB	2.0 KB	77.5%	View diff
examples/parse-json-from-api/assets/Orange Bubble Button_Idle.png	8.9 KB	2.1 KB	77.0%	View diff

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Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 14.3%, saving 871 B.

Filename	Before	After	Improvement	Visual comparison
examples/parse-json-from-api/assets/Orange Bubble Button_Idle.png	2.1 KB	1.6 KB	22.4%	View diff
examples/parse-json-from-api/assets/Orange Bubble Button_Hovered.png	2.0 KB	1.8 KB	11.7%	View diff
examples/parse-json-from-api/assets/Orange Bubble Button_Pressed.png	1.9 KB	1.7 KB	8.1%	View diff