Summary:
Does the UI only no backend.
Follow up work:
- Implement a way to remember when a user dimsmis the popups, so
that we don't show her again.
- After users clicks Finish adds a final popup saying "You can repeat this tour from the Help Center" , and in help center home page, have a link "Repeat Grist welcome tour", which opens, say, https://docs.getgrist.com/doc/lightweight-crm#repeat-welcome-tour, where the hash part tells us to repeat the tour.
Test Plan: Tested in project/OnBoardingPopups
Reviewers: paulfitz
Reviewed By: paulfitz
Differential Revision: https://phab.getgrist.com/D2892
