update Safe Apps monorepo README with project overview and package re…

[thegoodeth12]

…ferences

This commit enhances the documentation for the Safe Apps Developer Tools monorepo by providing:

• A visually enriched project introduction with Safe branding and key portal links.
• A table of all available packages with concise descriptions and links.
• Detailed instructions for developers on installing dependencies and running commands.
• Resources for testing Safe Apps via the production interface.
• Visual assets and license badge for better onboarding.

This update ensures contributors and integrators have a clear understanding of each package's purpose and how to get started quickly with Safe Apps SDK, React Hooks, Web3Modal, and more.

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Latest commit: eabbaf4

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[github-actions]

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