docs: Redesign README with updated versions and structure

[kiro-agent]

This pull request was created by @kiro-agent on behalf of @maschnetwork 👻

Comment with /kiro fix to address specific feedback or /kiro all to address everything.
_{Learn about Kiro Web}

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Summary

Completely redesigned the README.md with the following improvements:

• Corrected version numbers to match the actual codebase (Java 25, GraalVM CE 25.0.2, Maven 3.9.14, native-maven-plugin 0.11.5)
• Added CI badge (GitHub Actions build status)
• Added MIT-0 license badge
• Added Table of Contents with anchor links for easy navigation
• Improved formatting with tables for prerequisites and deployed resources
• Added CRT comparison table showing benefits vs default HTTP clients
• Added CI/CD section explaining the GitHub Actions workflow
• Proper tree characters in the project structure diagram
• Contributing and License sections linked to their respective files
• SQL syntax highlighting for the CloudWatch Logs Insights query

What was tested

• Verified all version numbers against Dockerfile, pom.xml, and template.yaml
• Confirmed all file paths in project structure match the actual repo layout
• Validated badge URLs and markdown formatting