feat: Initialize Symfony application structure with essential files

- Added index.php for application entry point.
- Created app.css for global styles.
- Introduced HomeController for handling the home route.
- Implemented Kernel class for application kernel.
- Added base.html.twig as the main template.
- Created index.html.twig for the home page layout.
- Set up Docker configurations for development and production environments.
- Included opcache configuration for development.

app/.env.example

@@ -0,0 +1,10 @@
+###> symfony/framework-bundle ###
+APP_ENV=dev
+APP_SECRET=changeme
+###< symfony/framework-bundle ###
+
+###> symfony/routing ###
+DEFAULT_URI=http://localhost
+###< symfony/routing ###
+
+APP_SHARE_DIR=var/share