Add Dockerfile for containerization

[SmolSoftBoi]

This pull request introduces Docker integration into the breadit project. A Dockerfile has been added to establish a consistent Node.js environment, ensuring seamless deployment. The Dockerfile handles dependency installation and the preparation of the Next.js production build, streamlining the deployment workflow. This integration is aimed at enhancing the overall efficiency of the deployment process.

I welcome any feedback and suggestions for further enhancements.