Add prettier and adjust eslint-config

[Souler]

We got feedback from some of our candidates that eslint tends to get in the way and the lack of an automatic formatting regarding some of the "opinionated" standards of the indistry make it hard to keep a consistent codestyle.

This PR aims at easing that linting-givin-problems part; hopefully making the process easier for anyone willing to take the challeng.

[javimbk]

Great changes with this so our candidates can just focus on the important stuff.

Left a nitpick comment on the final new line in package.json and also just for documentation purposes, these are failing but it makes sense since the implementation is not done yet. Just wondering if we should have a "clean" state by disabling and putting a comment to remove the disable when doing the solution.

➜  technical-test-frontend git:(add-prettier) ✗ npm run lint

> [email protected] lint
> eslint . --report-unused-disable-directives --max-warnings 0


/Users/javier/Dev/technical-test-frontend/src/lib/auth/AuthProvider.tsx
  25:11  error  'initialTokens' is assigned a value but never used  @typescript-eslint/no-unused-vars
  25:26  error  'onAuthChange' is assigned a value but never used   @typescript-eslint/no-unused-vars

/Users/javier/Dev/technical-test-frontend/src/lib/auth/useAuth.ts
  14:15  error  'email' is assigned a value but never used     @typescript-eslint/no-unused-vars
  14:22  error  'password' is assigned a value but never used  @typescript-eslint/no-unused-vars

✖ 4 problems (4 errors, 0 warnings)

[javimbk]

nitpick

Suggested change

	}
	}