Primary Color Customization

[tarunsinghofficial]

PR Fixes #155

Changes Done:

• Implemented primary color customization throughout the app in major components including buttons, texts, backgrounds, etc using the APP_PRIMARY_COLOR environment variable.
• Changed the background UI of RouteModal and StopPane.

Screenshots:

[coveralls]

coverage: 5.54% (-0.01%) from 5.55%
when pulling fb2366c on tarunsinghofficial:feature/primary-color-custom
into 35a7025 on OneBusAway:main.

[aaronbrethorst]

Setting APP_PRIMARY_COLOR as an environment variable is confusing to me: we don't set any other configuration values via environment variable.

I could see this making sense if it was possible to set APP_PRIMARY_COLOR within the .env file but that doesn't seem to work. Please let me know if I'm missing something here, and also please add documentation to the README.

[tarunsinghofficial]

Setting APP_PRIMARY_COLOR as an environment variable is confusing to me: we don't set any other configuration values via environment variable.

I could see this making sense if it was possible to set APP_PRIMARY_COLOR within the .env file but that doesn't seem to work. Please let me know if I'm missing something here, and also please add documentation to the README.

@aaronbrethorst You're right that setting the primary color via environment variable might seem inconsistent with our other configuration patterns. However, I've found that it does work when properly configured.

It wasn't working earlier because, without the quotes, the color value was being interpreted as a comment, and without dotenv, the environment variables weren't being properly loaded into the Tailwind configuration.

[aaronbrethorst]

Looking good, but there are a few more changes that need to be done before this can be merged:

• Secondary brand color needs the same treatment as primary color
• Add examples of both to .env.example

[tarunsinghofficial]

Looking good, but there are a few more changes that need to be done before this can be merged:

• Secondary brand color needs the same treatment as primary color
• Add examples of both to .env.example

Done the changes. Ready to 🚀 :)