Every page (after login) has access
to the User object via context.read/watch<User>().
This reduces localstore and asnyc operations,
as the screens do not have to load the user every time.
Additionally this prevents anyone from
using the without a user object.
and rewrote the component's network requests.
showSimpleSnackbar, allows displaying a simple snackbar,
with text and one action button, that can be clicked.
doNetworkRequest is supposed to be a wrapper for the
already existing post* functions.
It aims to make network requests and error handling easier,
by containing all the try&catch blocks
and being able to show snackbars.
