Add High-Contrast Color Scheme options (Accessibility)
New Feature
What does this MR do?
This MR refactors some more CSS and enables high-contrast light and dark color schemes in the settings menu. Both schemes were tested and passed a AAA accessibility contrast rating.
Related issues
Resolves #163 (closed)
Checklist
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Application works as expected when running from source -
There are dependency changes -
Liquidctl device mock tests are successful (if applicable) -
Any needed documentation changes have been made -
This MR is ready to be merged