Cleaned up and added tracking to highlights' section

#111
Removed nav tracking from storefront scripting

#111
Removed nav tracking from subbrand storefront scripting

#111
Updated tracking for brand boxes

#111
Added scroll tracking

#111
Cleaned up for merge

#111
Cleaned up for merge

Close #111
Merge branch 'feature/tracking' of https://github.com/jackjonesfashion/JJ-CSS into feature/tracking
Changed event category for GA

#111