chore(cdn): remove BunnyCDN sync and rename sync:bunny to sync:cdn

CDN files are synced through the coollabs-cdn GitHub repository only.
Remove the --bunny direct upload path, the BUNNY_API_KEY and
BUNNY_STORAGE_API_KEY settings, and rename the command to sync:cdn.

scripts/run

@@ -27,8 +27,8 @@ function test {
     docker compose -f docker-compose.yml -f docker-compose.dev.yml exec -T coolify php artisan test --testsuite=Feature -p
 }
 
-function sync:bunny {
-    php artisan sync:bunny --env=secrets
+function sync:cdn {
+    php artisan sync:cdn --env=secrets
 }
 
 function db:reset {