Web platform is not working - move from SSH to websockets

[joanroig]

SSH connections are not available over the browser, therefore the web version of the app is not working. As an alternative, try to implement websockets:

• Add a docker container that acts as a middleware: it communicates via websockets with the apps, and internally manages the minecraft docker container with docker commands
• Communication must be secured, use JWT tokens or similar
• Refactor the app to communicate with websockets instead of SSH