[Fix] oscar: move info box at top of the page

In low width devices like mobile, tablet etc, info box is present at
bottom of the page.

This change addresses the issue by rearranging column grids for low
width devices and move side bar at top of the page. See
  - https://getbootstrap.com/docs/3.3/css/#grid-column-ordering.
  - and Searx issue tracker (issue#1777), for more information.

Effect: Along with Info, Suggestion and Link boxes also move to top of
the page.

Resolves: #1777