Refactor monlift post function

Refactored monlift post function. It was sending a null value as a
request when the request and token are altogether empty
Refactored the rest mechanism completely

Now rest endpoint are not harcoded into the client but discovered
dynamically. The entry point of the application, is at the api/start
endpoint.
center card using the vertical centered
Merge branch 'master' of https://github.com/thefuture2092/monlift-client
reorganiser l'Affichage de la liste des lifts comme carte
personnalister l'affichage du profil selon que user soit driver ou pas