feat: Improve UI and readability of panels in detail pages

[janmichek]

Description

Resolves #397

Demo

Checklist:

• [ ] I have read and followed the Contributing Guide
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[janmichek]

THe preview has not been generated. Let's continue here https://github.com/aeternity/aescan/pull/717