Improve Next.js examples

[Nikolas]

• Add "Deploy with Vercel" button
• issue: README talking about an API route that doesn’t exist (/api/feed)

[Alex Ruheni]

Idea: Link to the fullstack-prisma-nextjs-blog template from the example README.

We'll have to switch the database provider if we want to add a deploy button. SQLite doesn't work too well on Vercel with Prisma. The last time I tried it, I ran into some errors — the SQLite file could not be found.

I would like to understand the purpose and intention we have with the Next.js examples to help decide if we should(n't) add the deploy button.

Here are some of the options I think we have:
Option 1: Add a deploy button, and update the database provider to make the deployment process smoother.

Option 2: No deployment button but link to fullstack-prisma-nextjs-blog template from the README.

[Alex Ruheni]

Another suggestion:

• Improve data serialization with superjson and next-superjson. We currently use a utility function to serialize DateTime values. Guide: https://flaviocopes.com/nextjs-serialize-date-json/

[Mayank]

Also needs refactor