Integrate User Documentation into GUI

[AndreasFreund]

User story

1. As a user
2. I want to easily reach the user documentation from the GUI
3. So that I have an easy way to troubleshoot if something goes wrong

Acceptance criteria

• Think about an easy way to include our current documentation into the application
• There should be no manual keeping in sync between repository and app, so it should be included in the build process
• Possible solution: convert all .md files in Repo to .html / .pdf or similar, add a link from the GUI which opens the folder containing the documentation or opens the browser with the main .html file containing links to the other documents
• Alternative solution (probably more annoying): Use the QT help framework for creating the documentation in the app

Definition of done (DoD)

• Code review has been completed
• Code has been merged
• Feature branch has been deleted
• Update method signatures in architecture diagram
• MCU & GUI build after merge__