feat: add playground styles

[aralroca]

#158

@enzonotario is working! ❤️

[aralroca]

@enzonotario I'll let you continue iterating. I was thinking:

• put a spinner while loading as Qwik does: https://qwik.dev/playground
• put a console to display the errors
• add type-safe, I tried to add Brisa's types but it doesn't work for some reason https://github.com/brisa-build/brisa/blob/084c3fa436d5b73e9bf41de796655213c63e99a3/packages/www/src/helpers/monaco-extra-libs/index.ts
• do it responsible for mobile

Thank you very much for all your help