Revise before V1 release

[doomsayer2]

• Check if the floating buttons are responsive and how they behave on different devices. If they are not make them responsive. Both
• Check if the "Auswerten" button and the "Weiter" buttons are responsive and scale on different devices. If they are not make them responsive. Both
• Adapt the visualizations on the viz page when in print mode to not be broken. Maybe make one visualization for each page.
• Generally see how the applciation behaves on different devices. Both

[doomsayer2]

• Titlescreen Buttons same color and adapt the symbols (arrow seems slimer than triangle); Also make the text a button (all is a button) Lydia
• Font for stepper at evaluation page should be in grey color. Lydia
• Revise Note taking, especially the info about available formating. Lydia
• Remove all focus from elements and unify the borders. Lydia & Florian
• Regex Issue "invalid regular expression invalid group specifier name" Safari Florian
• Restore responsiveness. Florian