[nojira] -- Engagement Index Ready to Demo

**PR Crucial for today's meeting**

**Updates:**
*Removed button header sort
*Made code more efficient (from landing page --> the two other views)
*Fixed current user highlighting
*Removed current user score blue alert info wrapper
@richcreationsrc why are we setting the score to this URL?

Shouldn't this just be `return '/engagement_index_share'` instead?