[wp.org review]New upselling

[rodica-andronache]

Like on shop isle:

• [x] remove current upsells buttons http://prntscr.com/d45ise
• [x] at the end of the customizer, add the View Pro version like on shop isle http://prntscr.com/d45j92
• [x] at top of customizer, add the Theme Info section like on shop isle with:
  • Documentation - link http://docs.themeisle.com/article/185-bookrev-lite-documentation
  • Leave a review - link https://wordpress.org/support/theme/book-rev-lite/reviews/