- export mutation handler for request retrieving payment url

when the credentials are good. make request to retrieve user informations before navigating to the home page for authenticated user.

getUserInformations request to retrieve the relevant informations about user. check IuserInformations type for the response format.

- manually rounding the white container around the input amount
- remove the balance container container
- add 'montant à payé' label and its amount right below it.
- continuously update the total in the header part when changed

remove the wrapper around the image. the styling of the container will be left to the component that need to render it

had to downgrade all the fix expo did because navigation was breaking all around causing app to crash.