Add docs setup in CONTRIBUTING.md

[fabriziofs]

📚 Description

Add documentation for CONTRIBUTING.md.

I'm also thinking about adding this documentation in a specific page inside the documentation itself, and in the CONTRIBUTING.md only add a reference to that page, what do you think 🤔

Closes #83

🔖 Changes

• Add docs

✅ To-do list

• Make sure that all the pipeline passes
• Make sure to update the CHANGELOG.md to reflect the new feature or fix

[antonio-gg-dev]

It would be useful to add a link to the instructions for installing nvm on Linux and macOS https://github.com/nvm-sh/nvm#installing-and-updating and also for Windows https://github.com/coreybutler/nvm-windows#installation--upgrades.

I also believe it would be worthwhile to indicate that if they don't have the version we require in our .nvmrc, it's as simple as running nvm install, and to have yarn in that version of node all you need to do is run npm i -g yarn.

Lastly, I think I would add to the documentation that it's advisable to run yarn docs:build before creating the PR to ensure that the build works, as this step has certain checks like ensuring there are no dead links, etc.

[antonio-gg-dev]

And I also think it would be very useful to indicate that our documentation is in the 'docs' and is created with VitePress, along with a link to its documentation https://vitepress.dev/ .

[fabriziofs]

@Tito-Kati I make some changes following your suggestions, can you take a look pls? If there's anything more to add/modify dot hesitate to point it out

Thank you!

[antonio-gg-dev]

Nice work!