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/creating-rounds.md

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+# Creating Rounds
+
+This guide explains how to create, configure, and manage music quiz rounds in Quizzical Beats.
+
+## Understanding Round Types
+
+Quizzical Beats offers several types of quiz rounds:
+
+- **Random Selection**: Creates a diverse round with randomly selected songs
+- **By Decade**: Songs from a specific decade that has been used the least in your quizzes
+- **By Genre**: Songs from a specific genre that has been used the least in your quizzes
+- **By Tag**: Songs that share a specific tag from your collection
+
+## Creating a Basic Round
+
+To create a new quiz round:
+
+1. From the Dashboard or Rounds page, click "Create New Round" or "Build Round"
+2. Enter an optional name for your round
+3. Select the round type by choosing one of the available cards:
+   - Random Selection
+   - By Decade
+   - By Genre
+   - By Tag (select a specific tag from the dropdown)
+4. Click the corresponding "Generate" button for your chosen round type
+5. Review the generated round with its selected songs
+6. Optionally modify the round name
+7. Click "Save This Quiz" to save your round
+
+## Reviewing Generated Rounds
+
+When a round is generated, you'll see:
+
+1. A preview of all songs in the round
+2. Information about each song (title, artist, year, genre)
+3. Audio previews you can play to check each song
+4. Options to save the round or generate a different one
+
+## Managing Saved Rounds
+
+After saving a round, you can manage it from the round detail page:
+
+1. Edit the round name by clicking the edit icon next to the title
+2. Add or remove songs
+3. Reorder songs by dragging and dropping them
+4. Save your changes using the "Save Changes" button
+
+## Song Management
+
+To modify the songs in your round:
+
+1. On the round detail page, you can:
+   - Remove songs by clicking the trash icon
+   - Add new songs by clicking the "Add Song" button
+   - Search for specific songs in the song library
+   - Reorder songs using drag and drop
+2. After making changes, click "Save Changes" to update the round
+
+## Export Options
+
+Create different formats of your round:
+
+1. **Generate MP3**: Creates an audio file with all songs, intro/outro, and announcements
+2. **Generate PDF**: Creates a printable document with the round information
+3. **Export to Dropbox**: Saves your round files to your connected Dropbox account
+4. **Send Email**: Sends the round details via email
+
+## Deleting Rounds
+
+To delete a round:
+
+1. Navigate to the round detail page
+2. Click the "Delete Quiz" button
+3. Confirm deletion in the confirmation dialog
+4. The round and its associated files will be permanently removed