Update requirement passage in README

# Overview

Our documentation should be updated to let new devs know that need Docker and we can remove the requirements for

# Demo

Currently reads:
```md
In order to run this app, you will need to have the following libraries installed on your machine:

Node: Javascript runtime
npm: Node Package Manager
Django: python web framework
Python 3.9+
```

# What is the expected behavior?

Should read something like:
```md
In order to run this app, you will need to have the following libraries installed on your machine:

Docker (Docker for Mac, or Docker for Windows)
```
With a link to the installation guide: https://docs.docker.com/get-docker/

Apri la README e individua il passaggio sui requisiti mostrato nell’issue. Aggiornalo in modo da elencare Docker invece di Node, npm, Django e Python, e collega Docker a https://docs.docker.com/get-docker/; il lavoro è completato quando la README corrisponde alla formulazione e al link richiesti.

Scritto dal modello di indicizzazione a partire dal testo della issue.