Adding more colors to tailwind.config.js

[stephiescastle]

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Description

This PR adds the following colors to our TailwindCSS config:

• jpl-red-darker #5C0411
• jpl-sky-blue #53C8ED
• jpl-sky-blue-dark #0080A4
• off-white #FAFAFA

These were originally in use only on WCP, but WWW will need the off-white color for the tertiary nav. This is also prep work for #9.

I was going to include the infrastructure for internal vs external themes with this change as well, but it requires a bit more thought and code changes, and I'd like to get the colors in before that.

Instructions to test

The colors are documented in the Storybook:

1. npm run storybook
2. View Foundation > Colors

Tested in the following environments/browsers:

Operating System

• macOS
• iOS
• iPadOS
• Windows

Browser

• Chrome
• Firefox ESR
• Firefox
• Safari
• Edge