Resolve "feat: Demo Config Builder UI"

What does this merge request do and why?

Add a basic UI example for creating config.

How to set up and validate locally

See README.md in /ui folder (also in the changes of this MR)

Merge request checklist

• I've ran the affected pipeline(s) to validate that nothing is broken. Not Applicable
• Tests added for new functionality. If not, please raise an issue to follow up. Not Applicable for this iteration
• Documentation added/updated, if needed.

%17.5 Closes #483 (closed)