Removing hardcoded paths

[Mrostgaard]

https://github.com/mongodb-labs/full-stack-fastapi-mongodb/blob/bdc9590985d5b3a68b0f685dc266c0a348a1c3b2/%7B%7Bcookiecutter.project_slug%7D%7D/frontend/tsconfig.json#L22-L23

These should probably just look like:

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

Instead of the hardcoded path that exists at the moment.