Issues with running prisma and Cypress

[list4c]

Hi, I started working with the course repo (no migrations of Cypress versions at all - just following the readme) and stumbled upon 3 issues:

1. I could not run prisma, because it got stuck on the command npm run db:setup. Error as in this post:
   Updating the package to version 3.13 solved the issue -- I could run prisma setup. Maybe not as serious as point 2, but without DB setup I guess some functionality might be missing.
2. Blocking issue with the Cypress plugins file. It was named index.ts and Cypress could not locate it. After renaming the file to pluginsFile.ts Cypress can display the list of tests and run them.
   3. Not a blocking issue, but adding it as an extra: One typescript flag was showing up in red and I swapped it with the recommended alternative. (uh, no, that actually blocks the app from compiling and some other upgrades would be needed. Removed)

Here's my branch with fixes, would you like a PR?

My environment: Ubuntu 22.04 LTS