Add comprehensive documentation for LeagueLedger

- Created architecture overview in development/architecture.md
- Added installation guide in getting-started/installation.md
- Developed user guide with detailed instructions in user-guide/overview.md, user-guide/teams.md, user-guide/qr-codes.md
- Implemented social login setup documentation in social_login_setup.md
- Updated index.md to include links to new documentation sections
- Configured mkdocs.yml for site structure and theme
- Added requirements.txt for documentation dependencies

docs/index.md

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+# LeagueLedger Documentation
+
+Welcome to the official documentation for LeagueLedger, a comprehensive team management and points tracking system designed for organizing competitions, tracking achievements, and managing team-based events.
+
+## About LeagueLedger
+
+LeagueLedger is a flexible platform that helps event organizers, team managers, and participants track points, achievements, and standings. Whether you're running pub quizzes, sports leagues, or any team-based competition, LeagueLedger provides the tools to streamline your operations.
+
+## Key Features
+
+- **Team Management**: Create, join, and manage teams with flexible access controls
+- **Points Tracking**: Award points to teams and individuals through various mechanisms
+- **QR Code System**: Generate and scan QR codes for easy point attribution
+- **Achievements**: Recognize accomplishments with customizable achievements
+- **Leaderboard**: Real-time standings for teams and individuals
+- **Event Management**: Organize and track attendance for events
+- **Social Login**: Multiple authentication options for streamlined user access
+- **Responsive Design**: Works on desktop and mobile devices
+
+## Documentation Structure
+
+This documentation is organized into several sections:
+
+- **[Getting Started](getting-started/installation.md)**: Installation, configuration, and quick start guide
+- **[User Guide](user-guide/overview.md)**: Comprehensive instructions for end users
+- **[Administration](administration/admin-panel.md)**: Managing users, teams, QR codes, and events
+- **[Development](development/architecture.md)**: Technical details for developers
+- **[Deployment](deployment/docker.md)**: Guides for deploying to production environments
+- **[Integrations](integrations/social-login.md)**: Working with external services
+
+## Quick Links
+
+- [Installation Guide](getting-started/installation.md)
+- [User Accounts](user-guide/user-accounts.md)
+- [Team Management](user-guide/teams.md)
+- [QR Code System](user-guide/qr-codes.md)
+- [Admin Panel](administration/admin-panel.md)
+
+## Support
+
+If you encounter any issues or have questions not covered in this documentation, please:
+
+1. Check the [FAQ section](faq.md)
+2. Search for similar issues in our [GitHub repository](https://github.com/yourusername/leagueledger/issues)
+3. Open a new issue if your problem hasn't been addressed
+
+## Contributing
+
+We welcome contributions to both the LeagueLedger project and its documentation. See our [Contributing Guide](contributing.md) for more information.