Refactor app into separate components

[eg3844540-svg]

[DEMO LINK](https://<your_account>.eg3844540-svg/react_decompose/

[mateacademy-ai-mentor]

Review Summary

Your implementation successfully meets all core technical requirements. The code correctly decomposes App.js into three components (Article, Header, Welcome) with proper folder-per-component structure and individual CSS files for each. All components use export default as required, and the navigation element is appropriately included within the Header component. The only issue identified is the DEMO LINK format in your PR body, which shows an internal build URL instead of the specified GitHub Pages format (https://<your_account>.github.io/react_decompose/). While this doesn't affect your code implementation, you'll want to update this for proper documentation. All functional requirements from the task are satisfied, and no test failures were reported. Your solution is approved.

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