Add dependencies for image generation

.github/workflows/generate-site.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pyyaml jinja2 requests python-dotenv
+          pip install pyyaml jinja2 requests python-dotenv selenium Pillow webdriver-manager
 
       - name: Generate HTML
         run: python generate_site.py