feat: Enhance CDN management with entrypoint script and update country data handling

cdn/entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Any setup tasks or checks can go here (if needed)
+echo "AdventureLog CDN has started!"
+echo "Refer to the documentation for information about connecting your AdventureLog instance to this CDN."
+echo "Thanks to our data providers for making this possible! You can find them on the CDN site."
+
+# Start Nginx in the foreground (as the main process)
+nginx -g 'daemon off;'