Make any improvements

[webbertakken]

This repository holds a decent base implementation on how to run a Symfony application with React frontend on a kubernetes environment.

However improvements need to be made:

• The latest upgrade of packages may have broken some functionality, which need to be fixed.
• Javascript packages need to be updated.
• Composer packages need to be updated.
• Docker containers need to be updated and configured to use the latest bitnami versions.
• Symfony should be updated to the latest version.
• After that deprecations need to be removed.
• Documentation can be improved.
• Kubernetes deployment files should be converted into a coherent helm chart.

Feel free to pick any of these improvements to the repository or suggest your own, so it can help others have an updated reference implementation.