[WAL-89] Onboarding page review

[JDSM01]

What does this PR do?

Removes last page of the onboarding Made changes to make onboarding match new discussed architeture Moved warning text below T&C in portrait and adjusted margins to fit in smaller devices

Database changed?

No

Where should the reviewer start?

OnboardingActivity.kt OnboardingPageChangeListener.kt OnboardingPresenter.kt

How should this be manually tested?

Go through Onboarding in both portrait and landscape

What are the relevant tickets?

https://aptoide.atlassian.net/browse/WAL-89

Questions:

Does this add new dependencies which need to be added? (Eg. new libs, new keys, etc.)

Code Review Checklist

• [ ] Architecture
• [ ] Documentation on public interfaces
• [ ] Database changed?
• [ ] If yes - Database migration?
• [ ] Remove comments & unused code & forgotten testing Logs
• [ ] Codestyle
• [ ] Functional QA tests pass