Add Google Maps integration documentation and update docker-compose for API key

documentation/docs/configuration/google_maps_integration.md

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+# Google Maps Integration
+
+To enable Google Maps integration in AdventureLog, you'll need to create a Google Maps API key. This key allows AdventureLog to use Google Maps services such as geocoding and location search throughout the application.
+
+Follow the steps below to generate your own API key:
+
+## Google Cloud Console Setup
+
+1. Go to the [Google Cloud Console](https://console.cloud.google.com/).
+2. Create an account if you don't have one in order to access the console.
+3. Click on the project dropdown in the top bar.
+4. Click **New Project**.
+5. Name your project (e.g., `AdventureLog Maps`) and click **Create**.
+6. Once the project is created, ensure it is selected in the project dropdown.
+7. Click on the **Navigation menu** (three horizontal lines in the top left corner).
+8. Navigate to **Google Maps Platform**.
+9. Once in the Maps Platform, click on **Keys & Credentials** in the left sidebar.
+10. Click on **Create credentials** and select **API key**.
+11. A dialog will appear with your new API key. Copy this key for later use.
+
+<!-- To prevent misuse:
+
+1. Click the **Edit icon** next to your new API key.
+2. Under **Application restrictions**, choose one:
+   - Choose **Websites** as the restriction type.
+   - Add the domain of the AdventureLog **backend** (e.g., `https://your-adventurelog-backend.com`). -->
+
+## Configuration in AdventureLog
+
+Set the API key in your environment file or configuration under the backend service of AdventureLog. This is typically done in the `docker-compose.yml` file or directly in your environment variables `.env` file.
+
+```env
+GOOGLE_MAPS_API_KEY=your_api_key_here
+```
+
+Once this is set, AdventureLog will be able to utilize Google Maps services for geocoding and location searches instead of relying on the default OpenStreetMap services.