Update Prisma example (vercel#29459)

* Correct branch name

* Delete .gitignore

* Update README.md


Co-authored-by: Lee Robinson <[email protected]>
Co-authored-by: JJ Kasper <[email protected]>

Author: 3 people

examples/with-prisma/.gitignore

@@ -1,6 +1,6 @@
-Prisma.io maintains it's own Next.Js examples
+The official examples are maintained by the Prisma team:
 
-- [Javascript](https://github.com/prisma/prisma-examples/tree/master/javascript/rest-nextjs)
+- [Javascript](https://github.com/prisma/prisma-examples/tree/latest/javascript/rest-nextjs)
 - [Typescript: rest-api-routes-auth](https://github.com/prisma/prisma-examples/tree/latest/typescript/rest-nextjs-api-routes-auth)
 - [Typescript: rest-api-routes](https://github.com/prisma/prisma-examples/tree/latest/typescript/rest-nextjs-api-routes)
 - [Typescript: rest-api-express](https://github.com/prisma/prisma-examples/tree/latest/typescript/rest-nextjs-express)