Check and resolve deploy warnings

[ErlerPhilipp]

1. pix2model-backend-1 | [2023-08-01T14:43:57Z][INFO] WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
2. babel-preset-react-app is part of the create-react-app project, which is not maintianed anymore. It is thus unlikely that this bug will ever be fixed. Add "@babel/plugin-proposal-private-property-in-object" to your devDependencies to work around this error. This will make this message go away.
3. material ui outdated