Added three new documentation files following modus primaris style:
- doc/ui-template-customization.md: Guide for extending JupyterHub UI
templates with RequireJS, Bootstrap 5, CSRF protection, and custom handlers
- doc/docker-socket-permissions.md: Docker socket access control documentation
covering group-based permissions, security implications, and best practices
- doc/notifications.md: Complete notification broadcast system documentation
including implementation details, API integration, error handling, and
troubleshooting
Updated UI screenshots in README.md:
- Replaced screenshot-restart-server.png with screenshot-home.png showing
complete user control panel (restart server + volume management)
- Added screenshot-send-notification.png showing admin notification broadcast
interface with message composer, type selector, and delivery results
All documentation follows consistent structure: brief overview, key facts in
bullet points, explanatory narrative, and technical specifications without
excessive nesting or marketing language.
