feat(web): New onboarding

[SokratisVidros]

What changed? Why was the change needed?

Flow

1. Run npx novu@latest dev
2. Visit http://localhost:2022/studio
3. Redirect to https://web.novu.co/local-studio/auth
4. If signed in, redirect back to http://localhost:2022/studio?local_studio_url=... and load the studio iframe with src = local_studio_url
5. If not signed in, redirect to sign-in or sign-up (consult the nv_onboarding_step cookie) with redirect_url=https://web.novu.co/local-studio/auth
6. When authentication is complete, the browser will redirect to step 3 and replay the following steps.

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[scopsy]

@antonjoel82 thank you for the feedback! Applied most of it, the rest was making some troubles so for the sake of time I will leave it as is for now. We just have a few dependant changes with this PR I would love to resolve 🙏