fix: Add config.yml support for Docker deployment

Mount config.yml into Docker container and provide example template.

Changes:
- Mount config.yml as read-only volume in docker-compose.yml
- Create config.example.yml template for users
- Add config.yml to .gitignore (contains sensitive settings)
- Update README.md with config file setup instructions

Fixes 'Config file not found' error in Docker deployment.

Users should:
1. Copy config.example.yml to config.yml
2. Edit config.yml with their settings
3. Run docker compose up -d

README.md

@@ -60,10 +60,15 @@ A lightweight, cost-conscious Discord moderation bot focused on essential protec
    cd guardden
    ```
 
-2. Create your environment file:
+2. Create your configuration files:
    ```bash
+   # Environment variables
    cp .env.example .env
    # Edit .env and add your Discord token
+   
+   # Bot configuration
+   cp config.example.yml config.yml
+   # Edit config.yml with your settings
    ```
 
 3. Start with Docker Compose:
@@ -84,10 +89,15 @@ A lightweight, cost-conscious Discord moderation bot focused on essential protec
    pip install -e ".[dev,ai]"
    ```
 
-3. Set up environment variables:
+3. Set up configuration:
    ```bash
+   # Environment variables
    cp .env.example .env
-   # Edit .env with your configuration
+   # Edit .env with your Discord token
+   
+   # Bot configuration
+   cp config.example.yml config.yml
+   # Edit config.yml with your settings
    ```
 
 4. Start PostgreSQL (or use Docker):