chore: fix update docker hub readme flow

[janishorsts]

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[gemini-code-assist]

Summary of Changes

Hello @janishorsts, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the project's documentation by centralizing the Docker Hub README content within the main README.md file and significantly enhancing the CONTRIBUTING.md with comprehensive development and deployment information. This streamlines the documentation flow and improves clarity for both users and contributors.

Highlights

• Documentation Restructuring: I've consolidated the content intended for the Docker Hub README into the main README.md file. This involved moving specific tag information and a concise description of the dind image from the now-removed docs/dockerhub.md.
• Enhanced Contribution Guide: The CONTRIBUTING.md file has been significantly expanded to include comprehensive details on how images are built, dependency management, repository structure, testing procedures, and deployment. This provides a much clearer guide for new and existing contributors.
• Automated README Updates Alignment: The Renovate configuration (.github/renovate.json5) has been updated to correctly point to README.md as the source for Docker Hub README content. This ensures that automated updates reflect the primary documentation source.

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[gemini-code-assist]

Code Review

This pull request consolidates documentation from docs/dockerhub.md into README.md and CONTRIBUTING.md. The Renovate configuration is updated to target README.md for updates. I've identified a few areas for improvement in the new documentation, including a broken link, some typos, and formatting issues.