Circleci project setup

[Dargon789]

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PR-Codex overview

This PR focuses on enhancing the thirdweb-dashboard project with CircleCI integration and improving the security policy documentation, along with modifications to the embed-setup.tsx file for better API key validation.

Detailed summary

• Added CircleCI configuration in .circleci/config.yml.
• Introduced GitHub Actions workflow in .github/workflows/nextjs.yml for deploying a Next.js site.
• Updated SECURITY.md with supported versions and vulnerability reporting guidelines.
• Improved API key validation logic in embed-setup.tsx.

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Latest commit: e26d0fc

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[graphite-app]

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[vercel]

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