Adds additional pages to Taskbar Edu.

Currently there are pages for the following:
 - Splitscreen
 - Customize (add apps/predicted apps)
 - Docking (long press to hide)

At the moment they all use the same placeholder
image from before.

Button states:
 Page 1: Close and Next
 Page 2: Back and Next
 Page 3: Back and Done

You can also swipe left and right between the pages.

Demo: https://drive.google.com/file/d/1_D3i-jZxCRRVHV92p6hG5cm3VGcJ_bhK/view?usp=sharing&resourcekey=0-KHLHTTx67JlmVv-UZoAUAw

Bug: 180605356
Test: Manual
Change-Id: Ibbb81610a611f6ca412e53ed90dc1c67764f417e