Update welcome page

What does this MR do and why?

• Remove old illustrations
• Use icons to make new users familiar with our interface metaphors
• Add animations on hover
• Add onboarding action card component (with different variants, different states)

Next steps

• Add more delight ✨
• Add more cards
• Keep this onboarding available longer (30 days like a trial, maybe?)
• Use welcome page in the navigation bar, like the trial welcome page
• Show progress

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Go to http://gdk.test:3000/admin/users/reported_user_1
2. Click [Impersonate]
3. See updated welcome page

#457239 (closed) &12821