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/getting-started.md

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+# Getting Started with Quizzical Beats
+
+Welcome to Quizzical Beats, your ultimate music quiz round generator! This guide will help you get started with the application and create your first music quiz round.
+
+## Creating Your Account
+
+1. Navigate to the Quizzical Beats login page
+2. Click on "Register" to create a new account
+3. You can register using:
+   - Email and password
+   - Google account
+   - Spotify account
+   - Authentik (if enabled by your administrator)
+
+## Setting Up Spotify Integration
+
+To access Spotify's vast music library:
+
+1. Go to your account settings
+2. Click on "Connect to Spotify"
+3. Follow the authorization prompts
+4. Once connected, you'll be able to import songs and playlists directly from Spotify
+
+## Understanding Music Metadata
+
+Quizzical Beats uses multiple music services to provide rich metadata for your songs:
+
+1. **Spotify**: Provides song previews, album artwork, release dates, and audio features
+2. **Deezer**: Alternative source for song previews and metadata
+3. **Last.fm**: Enhances songs with genre information and music tags
+4. **ISRC Matching**: When available, uses standardized recording codes to match songs across services
+
+This multi-source approach ensures your music library has comprehensive information for creating diverse quiz rounds based on genres, decades, and other musical characteristics.
+
+## First-Time Setup
+
+After registering and logging in:
+
+1. Visit your profile settings to customize your experience
+2. Upload custom intro/outro/replay sounds if desired
+3. Configure your email preferences for notifications
+
+## Creating Your First Round
+
+Once you're set up, you can create your first quiz round:
+
+1. Click on "Create New Round" from the dashboard
+2. Choose a round type (random, by genre, by decade, etc.)
+3. Set the number of songs/questions
+4. Click "Generate Round"
+
+## Exporting Your Round
+
+After creating a round, you can export it in various formats:
+
+1. PDF document with questions and answers
+2. MP3 files for playback
+3. Directly to Dropbox (if connected)
+
+## Next Steps
+
+Now that you've created your first round, explore the [User Interface](user-interface.md) guide to learn about all the features available in Quizzical Beats.