feature-9075: Reduce complexity of mobile screens and minimize white spaces

[ghost]

Fixes #9075

Short description of what this resolves:

• Reduce complexity of mobile screens and minimize white spaces

Changes proposed in this pull request:

• Reduce complexity of mobile screens and minimize white spaces

Checklist

• [x] I have read the Contribution & Best practices Guide.
• [x] My branch is up-to-date with the Upstream development branch.
• [ ] The acceptance, integration, unit tests and linter pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated (UTC)
open-event-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 14, 2023 10:08am

[khangon]

Hi @norbusan , @mariobehling , @cweitat , We have completed ticket #9075 Please help me check and verify. Thanks,

Image1: event mobile page Image2: event start page