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/getting-started/installation.md

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+# Installation Guide
+
+This guide will walk you through the process of installing LeagueLedger on your system.
+
+## Prerequisites
+
+Before installing LeagueLedger, make sure you have the following prerequisites:
+
+- Python 3.10 or higher
+- pip (Python package manager)
+- Git (optional, for cloning the repository)
+- Docker and Docker Compose (optional, for containerized deployment)
+
+## Option 1: Installation with Docker (Recommended)
+
+The easiest way to get LeagueLedger up and running is using Docker and Docker Compose.
+
+### Step 1: Clone the Repository
+
+```bash
+git clone https://github.com/yourusername/leagueledger.git
+cd leagueledger
+```
+
+### Step 2: Create Environment File
+
+Create a `.env` file in the project root or copy from the example:
+
+```bash
+cp .env.example .env
+```
+
+Edit the `.env` file to configure your environment variables.
+
+### Step 3: Start with Docker Compose
+
+```bash
+docker-compose up -d
+```
+
+This will start all the required services including:
+- Web application
+- MySQL database
+- PHPMyAdmin for database management
+- Mailpit for email testing
+
+### Step 4: Access the Application
+
+Once the containers are running, you can access:
+- LeagueLedger web interface at [http://localhost:8000](http://localhost:8000)
+- PHPMyAdmin at [http://localhost:8001](http://localhost:8001)
+- Mailpit (email testing) at [http://localhost:8025](http://localhost:8025)
+
+## Option 2: Manual Installation
+
+For development or if you prefer not to use Docker, you can install LeagueLedger manually.
+
+### Step 1: Clone the Repository
+
+```bash
+git clone https://github.com/yourusername/leagueledger.git
+cd leagueledger
+```
+
+### Step 2: Create a Virtual Environment
+
+```bash
+python -m venv venv
+```
+
+Activate the virtual environment:
+
+=== "Windows"
+    ```
+    venv\Scripts\activate
+    ```
+
+=== "macOS/Linux"
+    ```
+    source venv/bin/activate
+    ```
+
+### Step 3: Install Dependencies
+
+```bash
+pip install -r requirements.txt
+```
+
+### Step 4: Configure Environment Variables
+
+Create a `.env` file in the project root with the following content:
+
+```
+SECRET_KEY=your-secure-secret-key
+DATABASE_URL=sqlite:///./leagueledger.db
+
+# Email configuration
+MAIL_USERNAME=your-email@example.com
+MAIL_PASSWORD=your-email-password
+MAIL_FROM=noreply@example.com
+MAIL_PORT=587
+MAIL_SERVER=smtp.example.com
+MAIL_TLS=True
+MAIL_SSL=False
+MAIL_FROM_NAME=LeagueLedger
+```
+
+Customize the values as needed.
+
+### Step 5: Initialize the Database
+
+```bash
+python -c "from app.db_init import init_db; init_db()"
+```
+
+### Step 6: Run the Application
+
+```bash
+uvicorn app.main:app --reload
+```
+
+The application should now be accessible at [http://localhost:8000](http://localhost:8000).
+
+## Verifying the Installation
+
+After installation, you can verify that LeagueLedger is working correctly by:
+
+1. Opening your browser and navigating to [http://localhost:8000](http://localhost:8000)
+2. Creating a new user account via the registration page
+3. Logging in with your new credentials
+
+The default admin credentials for the seeded database are:
+- Username: `admin`
+- Password: `password`
+
+!!! warning "Security Note"
+    If using the seeded database in production, make sure to change the default admin password immediately.
+
+## Next Steps
+
+- [Configuration Guide](configuration.md): Configure LeagueLedger for your specific needs
+- [Quick Start Guide](quick-start.md): Get started with using LeagueLedger
+- [Social Login Setup](../integrations/social-login.md): Set up authentication with social media providers