Post-Signup Interstitial Master Issue

[renanferrari]

This is a master issue for the work around the post-signup interstitial. This screen will be shown once, after signup or login, if the user account has no sites.

Blueprint

Tasks

• Create interstitial screen (issue, pull request)
  • Create layout
    • Standard
    • Dark Mode
    • Landscape
    • Tablet
  • Implement basic functionality
    • Make Create New Site button open its respective screen
    • Make Add a Self-Hosted Site button open its respective screen
    • Make Not Right Now button open the main screen
      • Ensure it redirects to the Reader tab
• Display interstitial screen (issue, pull request)
  • After signup epilogue screen
  • After login epilogue screen
  • Ensure it's being shown only once per app install
• Track interstitial screen events (issue, pull request)
  • When interstitial is seen
  • When the Create New Site button is clicked
  • When the Add a Self-Hosted Site button is clicked
  • When the Not Right Now button is clicked / the screen is dismissed

Notes

• There's an updated version of the blueprint, which I'll update this issue with once I have it in hand.
• I'm going to update the tasks with links for the specific issues and PRs once they're up.