Add new colors from identity guide and deprecate old color

[yvonnetangsu]

READY FOR REVIEW

Summary

• Adding new identity Guide colors to v6 https://identity.stanford.edu/design-elements/color/
• Deprecate colors that will be removed (no longer in Identity Guide)
• There are some colors that get to stay but have new names (added deprecation message)
• Update our color maps (core, nav, alerts) to use new color names and make sure alert component pulls colors from color map.
• Following proper sassdoc convention, remove $ sign in the @name field for the variable, add @type Color to all color variables.
  Note: I have tested this branch for the Redwood WP repo and the colors look normal to me.
  Note2: The variable for color Fog (and its variants) is called $su-color-foggy since we had $su-color-fog (which has become $su-color-foggy-light in v7) in v6 which was used very frequently. We discussed this in a Decanter meeting and I feel like this option could avoid some confusion in code.

Needed By (Date)

• When does this need to be merged by?

Urgency

• How critical is this PR?

Steps to Test

1. Look at the files changed
2. Make sure to expand (click "Load diff" under the file, in the GitHub Files changed tab) to see below file, since that's where most of the new code is:
   core/src/scss/utilities/variables/core/_colors.scss
3. Also check the color map scss files and see that they're using the new color variables properly
4. You can also test this branch on one of your projects that uses Decanter by setting the branch to
   git://github.com/SU-SWS/decanter.git#611-new-colors

Affected Projects or Products

• many things that uses decanter - d8, Redwood etc

Associated Issues and/or People

• JIRA ticket
• Other PRs
• Any other contextual information that might be helpful (e.g., description of a bug that this PR fixes, new functionality that it adds, etc.)
• Anyone who should be notified? (@mention them here)

See Also

• PR Checklist

[sherakama]

This looks great. Thanks for the big lift.

[sherakama]

Where is tugboat on this?

[yvonnetangsu]

Where is tugboat on this?

Thanks for reviewing! Looks like Tugboat is back. It's been over quota for me for a while now so I just assumed that it's dead - looks like you revived it 😃

[yvonnetangsu]

Took a look at the tugboat build and things look ok so I'm going to merge.