Moving .mainNav to inside of .mainheader

This will be necessary better fit the adjustments to larger displays. :)
Prevent h1 to overlay .viewNav and become it impossible to click.
Remove portrait.scss

For now the styles will be applied in a stylesheet who affect all
width >768px resolutions.
Add .wrapper markup

Necessary markup to set max-width and centralize content in larger
resolutions.
Adjustment of size and spaces.