templates: major UI tweaks

* fixed horizontall scroll in mobile version
* search box above breadcrumbs
* allignment of contact section
* placed the search box in the center of page
* size image resized to fit in navbar
* allignment of news feeds and boxes
* on going implementation of tabs keeping their state

Signed-off-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>