login button now changes dashboard heading to user

1) Manipulated the DOM by changing my cache of the username (from
logging in on the homepage) to display the username in the heading on
the dashboard page.
2) Added the dashboard with some placeholder layouts.
3) Changed the button on the login form so that it takes the users to
their dashboard upon submitting.
4) Manipulated the DOM by enabling the user to move the three main
blocks on the dashboard page by dragging and dropping on top of another
element.