readme: Add in-depth information about system architecture
This merge request updates the README.md
with improved clarity and structure, along with additional visual assets. Key changes include:
- Add a System Architecture section with a Mermaid diagram to illustrate the data flow from GitLab to Grafana.
- Reorganize the introduction and overview for better readability.
- Include the Automation section, detailing the CI/CD pipelines, job triggers, and performance alerts.
- Include a section for extra scripts used for monitoring and alerts.
Please check the current result here: https://gitlab.freedesktop.org/gallo/mesa-performance-tracking/-/blob/update_docs/README.md