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.

.env

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+# In all environments, the following files are loaded if they exist,
+# the latter taking precedence over the former:
+#
+#  * .env                contains default values for the environment variables needed by the app
+#  * .env.local          uncommitted file with local overrides
+#  * .env.$APP_ENV       committed environment-specific defaults
+#  * .env.$APP_ENV.local uncommitted environment-specific overrides
+#
+# Real environment variables win over .env files.
+#
+# DO NOT DEFINE PRODUCTION SECRETS IN THIS FILE NOR IN ANY OTHER COMMITTED FILES.
+# https://symfony.com/doc/current/configuration/secrets.html
+#
+# Run "composer dump-env prod" to compile .env files for production use (requires symfony/flex >=1.2).
+# https://symfony.com/doc/current/best_practices.html#use-environment-variables-for-infrastructure-configuration
+
+DOMAIN_NAME=https://your-wallabag-url.instance
+SERVER_NAME="Your wallabag instance"
+
+# two factor stuff
+TWOFACTOR_AUTH=true
+TWOFACTOR_SENDER=no-reply@wallabag.org
+
+# fosuser stuff
+FOSUSER_REGISTRATION=true
+FOSUSER_CONFIRMATION=true
+
+# how long the access token should live in seconds for the API
+FOS_OAUTH_SERVER_ACCESS_TOKEN_LIFETIME=3600
+# how long the refresh token should life in seconds for the API
+FOS_OAUTH_SERVER_REFRESH_TOKEN_LIFETIME=1209600
+
+FROM_EMAIL=no-reply@wallabag.org
+
+RSS_LIMIT=50
+
+LOCALE=en
+DATABASE_TABLE_PREFIX=wallabag_
+
+# redis stuff
+REDIS_SCHEME=tcp
+REDIS_HOST=localhost
+REDIS_PORT=6379
+REDIS_PATH=null
+REDIS_PASSWORD=null
+
+###> doctrine/doctrine-bundle ###
+# Format described at https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
+# IMPORTANT: You MUST configure your server version, either here or in config/packages/doctrine.yaml
+#
+DATABASE_URL="sqlite:///%kernel.project_dir%/data/db/wallabag.sqlite"
+# DATABASE_URL="mysql://root:@127.0.0.1:3306/wallabag?serverVersion=8&charset=utf8mb4"
+# DATABASE_URL="postgresql://app:!ChangeMe!@127.0.0.1:5432/app?serverVersion=14&charset=utf8"
+###< doctrine/doctrine-bundle ###
+
+###> nelmio/cors-bundle ###
+CORS_ALLOW_ORIGIN='^https?://(localhost|127\.0\.0\.1)(:[0-9]+)?$'
+###< nelmio/cors-bundle ###
+
+###> php-amqplib/rabbitmq-bundle ###
+RABBITMQ_URL=amqp://guest:guest@localhost:5672
+###< php-amqplib/rabbitmq-bundle ###
+
+###> sentry/sentry-symfony ###
+SENTRY_DSN=
+###< sentry/sentry-symfony ###
+
+###> symfony/framework-bundle ###
+APP_ENV=dev
+APP_SECRET=b6b54475f34a3238dec16508c4903ca0
+#TRUSTED_PROXIES=127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
+#TRUSTED_HOSTS='^(localhost|example\.com)$'
+###< symfony/framework-bundle ###
+
+###> symfony/mailer ###
+MAILER_DSN=smtp://127.0.0.1
+###< symfony/mailer ###