Update pyenv to install latest Python version dynamically and rewrite README with comprehensive documentation
- Changed dependencies.yml to query pyenv for the latest stable Python 3.x instead of hardcoding 3.13.2
- Rewrote README.md with full documentation covering: what gets installed, files that must be replaced (SSL certs, license, SSH key), passwords and secrets that need changing, inventory configuration, helper scripts, server types, monitoring, and cron schedules