refactoring to prepare for stackcore

[florianbgt]

Type of change

• make the UI a single component so we can use it anywhere in the future
• some UI fixes
• update readme

Description

Please include a summary of the changes and the related issue. Explain the
motivation behind this change.

Related Issue

Issue Number: #<issue_number>

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Checklist

• I have read the contributing guidelines
• My code follows the code style of this project.
• I have added tests that prove my fix is effective or that my feature works
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published