[FE] Improve responsiveness of WebApp

[thogebati]

Description

Since especially the voice feature might be most useful when operating on a mobile phone, our WebApp should not look entirely messed up on mobile. Check the status quo and see if there are some easy fixes we could do to improve the WebApp's responsiveness.

User story

1. As a user
2. I want / need responsive web app
3. So that I can use is on as many devices as possible

Acceptance criteria

• the status quo of our WebApp's mobile view has been checked
• the responsiveness has been improved

Definition of done (DoD)

• Work products are uploaded to the Github repository and merged to the main branch
• If necessary, the bill of materials section of the planning documents is updated
• Code/feature passes suited tests
• Code is peer-reviewed
• Help documentation (README) is updated
• Fits into our architecture, where possible

DoD general criteria

• Feature has been fully implemented
• Feature has been merged into the mainline
• All acceptance criteria were met
• Product owner approved features
• All tests are passing
• Developers agreed to release