FIXES: Bug where signup, signin,
edit room and new room screen would fail to open,
because the Flexible Widget cannot be nested in a
Centered Widget.
NOTE: Turns out the widget was not neccessary at all
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.
NOTE: Might be a good idea to move the title down,
if no description is available.
If ListTile does not support such feature,
maybe using an alternative might be good idea
