Streamline UI tooling

What does this merge request do and why?

This MR streamlines the configuration UI to the code base.

• Manage dependencies with poetry.
• Consolidate documentation to README.
• Remove duplicate .gitignore.
• Tweak UI layout and warning message.

Relates to #483 (closed)

How to set up and validate locally

1. Check out to this merge request's branch.
2. Run the follow command to run the UI.

   make run-ui

Merge request checklist

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