Update spanish tutorial

[raffazizzi]

We made two small but important changes to the tutorial and it would be useful to make them to the Spanish tutorial as well:

• using VSCode instead of Atom (Atom is being discontinued soon)
• using python3 or node instead of python 2 to run a server

You can see a summary of changes here: https://github.com/TEIC/CETEIcean/pull/58/files

Would you be able to update the ES tutorial accordingly?