Major updates.

Header updates to use a cut out image of Michelle and combine it with a
separate background image for maximum flexibility.

Fixed laptop and mobile menu that was not hiding due to specificity.

Updated variables including $color-main.

Updated page background from white to dark blue.

Chaged text colour to white when it lays on the dark blue background
and created a .block class to use that gives a module a white
background, padding and a drop shadow.