Improvement on the Banner view pager:

[fgei]

• Switch the view pager adapter from FragmentPagerAdapter to a PagerAdapter, to avoid any problems with fragment inside fragment.
• Correctly stop the handler that animates the view pager to remove any callbacks when the view holder is detached so we can avoid any possible leak.
• Create an onboaridng class to handle all the on boarding data images and text.
• Remove some commented code and unnecessary log showing in the crash report.

Description: Replace the Banner adapter to PagerAdapter to not use fragments.

Reviewer Checklist:

• [x] Ensure the PR solves the problem
• [x] Review every line of code
• [x] Ensure the PR does no harm by testing the changes thoroughly
• [x] Get help if you're uncomfortable with any of the above!
• [x] Determine if there are any quick wins that improve the implementation

PR DRI Checklist:

• [x] Get advice or leverage existing code
• [ ] Agree on technical approach with reviewer (if the changes are nuanced)
• [ ] Ensure that there is a testing strategy (and documented non-automated tests)
• [ ] Ensure there is a documented monitoring strategy (if necessary)
• [ ] Consider systems implications (Database connections, Grafana stats, CPU)

[fgei]

thanks @subsymbolic, merging now!