:bug: Incorrect instructions on the `Python` section in `Tech Setup`

[ChristinaLast]

In the Python section we use an ssh tunnel to connect to jupyter lab on the training VM. This command:

$ ssh localhost:{YYYY}:localhost:{XXXX} andrewid@training.dssg.io

actually requires the following flags:

 $ ssh -i ~/.ssh/id_rsa -N -L localhost:{YYYY}:localhost:{XXXX} andrewid@training.dssg.io