Adding theme colors

[bladebunny]

Related Issue

Fixes #347 This is a partial fix to add color themes. Naming is a bit cumbersome (lightTheme/DarkTheme) but is necessary to disambiguate system light and dark named colors.

Checklist:

• [x] I have read the contributor's guide.
• [x] I linked an issue in the previous section
• [x] I have commented on the linked issue
• [x] I was assigned the linked issue (not required)
• [x] I have tested the change to the best of my ability against the sandbox or a local build.

Optional items:

• [ ] My change adds new text and requires a change to translations.

• [ ] My change requires a change to the documentation.

• [ ] I have submitted a PR to the documentation repo.

• [ ] I was not able to test... (explain below, e.g. you did not have permissions to test a specific feature)

• [ ] This change depends O-FISH Realm repository changes (explain below)

• [ ] This change depends O-FISH Web repository changes (explain below)

• Optional: Add any explanations here This is the first step toward adding light/dark mode. Breaking up changes into smaller PRs.

• Optional: Add any relevant screenshots here

[bladebunny]

Closing this for now. Looking to use color resources instead.

[Sheeri]

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