chore: update favicons

[DiogoSoaress]

• Align website icons with https://app.safe.global -> prefer the green circle background.
• Moved the /favicons folder directly under the /public folder

[github-actions]

Branch preview

✅ Deployed successfully in branch deployment:

https://update_favicons--homepage.review.5afe.dev

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}