This cleans up the styling of the page by adding the white box
around the text content, and by making the header the same
`.get-started` class as other headers in the portico-signup group.
These handlers will kick into action when is_signup is False. In case
the account exists, the user will be logged in, otherwise, user will
be asked if they want to proceed to registration.
Brock Whittaker
Umair Khan
Vaida Plankyte
Tim Abbott