feat: add src directory

[kgajera]

Adds src directory.

Changes

Changes

• Reorganizes to use src directory: https://github.com/echobind/bisonapp/tree/feat/src-directory/packages/create-bison-app/template
• Moves tests/factories to prisma/factories
• tsconfig path changes:

  "paths": {
    "~/*": ["./*"],
    "@/*": ["./src/*"]
  }

Checklist

• [ ] Requires dependency update?
• [x] Generating a new app works