[system][docs] Update Overview page with additional advantages

[yassinmars]

This commit enhances the Overview document by adding additional advantages of MUI System. The new advantages provide a more comprehensive understanding of the benefits of using the MUI System for building custom designs. This contribution aims to improve the clarity and completeness of the documentation.

• [x] I have followed (at least) the PR section of the contributing guide.

[mui-bot]

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• docs/data/system/getting-started/overview/overview.md

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[mapache-salvaje]

Hi @yassinmars 👋 I appreciate your interest in contributing to the docs. This PR doesn't meet our standards in terms of style, formatting, tone, and voice. Most of the changes are just to swap out synonyms (often awkwardly), and the content that's been added reads like AI-generated text to me. I'm going to close this here. If you'd like to make another contribution, I would suggest looking for open issues with the docs and/or ready to take tags, and avoid using generative AI for a better chance at getting your PR merged. Cheers.