Update README.md

Author: do6pbln9l

README.md

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 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Docker](https://img.shields.io/badge/Container-Docker-blue)](https://ghcr.io/do6pbln9l/hh-oauth2-app)
 
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 > **DevOps/SRE showcase project:** Automated OAuth2 infrastructure with **99.9% uptime**, CI/CD via GitHub Actions, Docker containers, systemd automation, and nginx reverse-proxy.
 
 **Key Metrics:**