Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

config/packages/prod/sentry.yaml

@@ -0,0 +1,22 @@
+sentry:
+    dsn: '%env(SENTRY_DSN)%'
+    options:
+        excluded_exceptions:
+            - Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+            - Symfony\Component\Security\Core\Exception\AccessDeniedException
+
+#    If you are using Monolog, you also need these additional configuration and services to log the errors correctly:
+#    https://docs.sentry.io/platforms/php/guides/symfony/#monolog-integration
+#    register_error_listener: false
+
+#    monolog:
+#        handlers:
+#            sentry:
+#                type: service
+#                id: Sentry\Monolog\Handler
+
+#    services:
+#        Sentry\Monolog\Handler:
+#            arguments:
+#                $hub: '@Sentry\State\HubInterface'
+#                $level: !php/const Monolog\Logger::ERROR