updates to browse page layout

1) Go to main site.
2) Click Browse Subjects from the search box in the header.

On the new Browse page at http://next.dev.curriki.org/xwiki/bin/view/Main/Browse, please make the following adjustments:

• Insert an extra paragraph break under the Arts heading so that the image for Arts lines up with the other images in that row.

• Make the images under each header hot/clickable to their respective subject area, the way the header line is. The images should also show alt text for their respective subject areas.