Add comprehensive documentation for Quizzical Beats

- Created a detailed database schema document outlining tables, relationships, and key fields.
- Added OAuth integration documentation covering Spotify and Dropbox authentication processes.
- Introduced a FAQ section addressing common user inquiries about the application.
- Developed a user-friendly index page for easy navigation of the documentation.
- Specified documentation dependencies in requirements.txt for building the documentation site.
- Expanded user guide with sections on account management, creating rounds, exporting rounds, getting started, importing songs, and user interface navigation.
- Updated mkdocs.yml for improved site structure and navigation.

docs/user-guide/user-interface.md

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+# User Interface Guide
+
+This guide provides an overview of the Quizzical Beats user interface to help you navigate the application efficiently.
+
+## Dashboard
+
+The dashboard is your main hub in Quizzical Beats, providing quick access to:
+
+- **Recent Rounds**: Your most recently created quiz rounds
+- **Quick Actions**: Buttons for common tasks (Create New Round, Import Songs)
+- **System Status**: Information about your Spotify connection, Dropbox status, etc.
+
+## Main Navigation
+
+The main navigation menu is located at the top of the screen and includes:
+
+- **Dashboard**: Return to the main dashboard
+- **Rounds**: View and manage all your quiz rounds
+- **Songs**: Browse and manage your song library
+- **Import**: Access options for importing songs from Spotify and other sources
+- **Export**: Options for exporting your quiz rounds
+- **Profile**: Access your user profile and settings
+
+## Rounds Page
+
+The Rounds page displays all your created quiz rounds with:
+
+- **Search & Filter**: Find rounds by name, date, or type
+- **Round Cards**: Preview of each round with options to edit, play, or export
+
+## Song Library
+
+The Song Library provides a comprehensive view of all songs in your database:
+
+- **Search**: Find songs by title, artist, album, or year
+- **Filter Panel**: Filter songs by genre, decade, tags, and more
+- **Preview**: Play song snippets directly in the browser
+
+## Round Creator
+
+When creating or editing a round:
+
+- **Round Properties**: Set name and round criteria
+- **Song Selection**: Add songs manually or use the auto-generator
+- **Arrangement**: Reorder songs in your round
+- **Preview**: Test your round with the built-in player
+
+## Settings Area
+
+The account settings area allows you to:
+
+- **Profile**: Update your user information
+- **Password**: Change your password
+- **OAuth Connections**: Manage connections to Spotify, Dropbox, and other services
+- **Audio Settings**: Configure custom intro, outro, and replay sounds
+
+## Admin Settings
+
+For administrators, additional settings include:
+
+- **System Settings**: Configure global application settings
+- **User Management**: Manage user accounts
+- **System Health**: Monitor application status
+- **Backup & Restore**: Manage database backups