Added an onboarding component to the app

I finally got around to adding an onboarding component to the app. Before if plopped you right into the dashboard without really showing you what to do next. There was a small link to "Create a banner" but other than that, it wasn't clear on what the app did or what steps you needed to take.

Happy to say I fixed that today. We now have an onboarding component that walks you through the 5 major steps in order to get a banner live on your website.

1. Create Your Account (already completed for the user ✅)
2. Add Website URL 🌐
3. Create Your Banner ✏️
4. Install Your Banner ⚙
5. Enable Your Banner ⚡️