STA-931|restruct project and clean php docker file

app/.env

app/.env.test

app/.gitignore

app/assets/app.js

app/assets/bootstrap.js

app/assets/controllers.json

app/assets/controllers/hello_controller.js

app/assets/styles/app.css

app/bin/console

app/bin/phpunit

app/composer.json

app/config/bundles.php

app/config/packages/asset_mapper.yaml

app/config/packages/cache.yaml

app/config/packages/debug.yaml

app/config/packages/doctrine.yaml

app/config/packages/doctrine_migrations.yaml

app/config/packages/framework.yaml

app/config/packages/mailer.yaml

app/config/packages/messenger.yaml