UX revamp - onboarding

(note: this is the original onboarding ticket, that got postponed out of Qt Creator 17 on account of resourcing issues, the Qt Creator 17 content was seriously stripped down)

What

• implement the first phase of onboarding new users with a prompting wizard that allows the user to change and validate their environment 
• overview tab in home-mode 
• Updated UI tour that presents the Qt Creator UI

Why

• The current onboarding is incomplete, especially to novice users
  • Specifically, Qt Creator may be in a unusable state (e.g. missing framework entirely or other components) 

Dependencies

• UX revamp - notifications 
• Upon starting Qt Creator for the first time, Qt Creator shall prompt the user for answers to ensure that their tool has been set up properly
  • content
    • theme & language selection 
    • Qt version display / selection (and confirmation that it is what the user expects)
    • telemetry & sentry use confirmation
    • personalization questions
      • start with targets 
    • target display (and confirmation that it is what the user expects) 
    • summary of changes & possible prompt to restart 
  • The user can re-run this setup wizard later (initiated from the overview tab?) 
  • The confirmation pages provide means to invoke maintenance tool to change the environment when necessary (do not implement directly in Creator) 
• Home-mode shall contain a new overview-tab
  • Get started actions
    • Take UI tour (is the description in the concept sufficient, is the tour depth sufficient?)
    • Create sample project
      • Bypass most parameters (filename only?)
      • Separate template (with an interactive element or few)? 
    • View Qt Creator documentation 
    • View Qt framework documentation
  • What happens when clicking the account-button? 
  • What is shown under "recommendations"?
    • OPEN Does content change as user consumes it or is the display static? 
• OPEN Are recommendations displayed also in the other tabs (learning etc)?