Source Formatting: Move navigation rules (980px min-width)

Reorganizing responsive rules to make it easier to maintain
Source Formatting: Move banner rules (980px min-width)

Reorganizing responsive rules to make it easier to maintain
Bugfix: Correcting padding of page-title for large banners

It was previously set to have "auto" padding on the left and right, but
that value is invalid, so it was changed to just bottom padding.