Make setting up a remote connection for support easier

[Johannes-Thiel]

Motivation

When doing support, we often have to debug the internet connection. The aim of this script is to streamline this process.
To do that, the script will check the internet connection. If an Air Link token is provided, the script will check if Air Link is installed. If not, it will install Air Link and add the token. If Air Link is installed, it will update the Token.
Following this, if the Nebula certificates are provided, the old certificates will be backed up and the new ones will be moved to the correct folder.

Implementation

Progress

• I chose a meaningful title that completes the sentence: "If applied, this PR will..."
• I chose meaningful labels (if GitHub allows me to so).
• The implementation is complete.
• Tests with a real hardware have been successful (or are not necessary).
• Pytests have been added (or are not necessary).
• Documentation has been added (or is not necessary).