1.1.1 minor text changes

Small improvements in the Learning/About/References sections.

Full Changelog: v1.1.0...v1.1.1

1.1.0 fix config globals

Major issue where I was using globals to store UI state, which is NOT reset by streamlit on each user session !
The fix was to use session_state as they designed to.

Full Changelog: v1.0.1...v1.1.0

1.0.1 minor doc improvements

Full Changelog: v1.0.0...v1.0.1

1.0.0 2023 upgrade

Full refactoring of the application to work with the latest version fo streamlit.
Code is cleaner, UI should look better.
New feature is a plot of the value in an UCS chromaticity diagram.