change structure of each index.html and added different css

[metalinjection]

Hi there, I did it! Did my first js changes :smile: Please check so I can try the push from a fork on github as well :laughing:

Cheeeeers

[ztiromoritz]

Please use a cdn link for the theme: https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/styles/qtcreator-light.min.css