Theming - High contrast theme

[andrew-ronaldson]

Goal

Create a new theme (with light/dark modes) that has a more prominent contrast to support users requiring higher contrast levels.
Both PatternFly and product teams have received feedback that our users would like to have more accessible options for their vision requirements.
This theme will be our first offering towards the larger goal of accessible themes that empower all users.

Core follow up work tracked in: patternfly/patternfly#7448

[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.