Theming - Investigate High contrast theme

[andrew-ronaldson]

Goal

Create a new theme (light/dark) that has a more prominent contrast to support users requiring higher contrast levels.

[jamestalton]

I opened a different issue on this a lang time ago about having themes for color blind accessibility.
Would be nice to do these together.

[andrew-ronaldson]

Thanks for the update, James. I'll look for the old one and add them here for more context.