Redesign Website Mainpage

[zieglerSe]

Currently uses Fornax, which is nice but not best fit for the usecase.

We will redesign it with Feliz.React finishing some of the issues on the respective repository during refactoring.

• [x] https://github.com/fslaborg/fslaborg.github.io/issues/11
• [x] https://github.com/fslaborg/fslaborg.github.io/issues/48
• [x] https://github.com/fslaborg/fslaborg.github.io/issues/49
• [ ] https://github.com/fslaborg/fslaborg.github.io/issues/51
• [ ] https://github.com/fslaborg/fslaborg.github.io/issues/52

This will also deprecate all issues related to former framework specific tools.

@Freymaurer