Update configuration and enhance newsletter generation features

- Change WIKI_API_URL in .env.example and config to point to the new API endpoint.
- Set COOKIE_SECURE to false for local development in .env.example and config.
- Improve the newsletter generation logic to handle new and edited articles separately.
- Add display options for showing date, user, and category in the newsletter output.
- Enhance error handling for Wiki API requests and update templates for better user feedback.
- Update CSS for new UI elements and improve overall layout in dashboard and login pages.

app/templates/base.html

@@ -19,5 +19,6 @@
 <main class="container">
     {% block content %}{% endblock %}
 </main>
+{% block scripts %}{% endblock %}
 </body>
 </html>