Update new Charts color palette for better accessibility and contrast

[JackRobards]

This is a follow-up from these two PRS:

• Adding new Charts color palette: Add new Chart Specific Color Palette #369
• Adding new surface and background colors: chore: Add new color options for surface and backgrounds #326

Originally when the new chart palette was designed, it was intended to work alongside the new surface/dash-widget color. After some discussion, we've decided it would be better for the new palette to work alongside the previously existing surface colors instead to keep things more consistent.

So, this PR updates the chart colors to meet accessibility requirements when they are used alongside the existing surface colors. It also removes the surface/dash-widget color, since it is not in use and is no longer needed.

[changeset-bot]

🦋 Changeset detected

Latest commit: af83823

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[ynotdraw]

Due to the removal of a style here, I think we may want a major version update, as to not surprise consumers. Even if the only consumers are us, internally, it'd be nice to follow semver. What are your thoughts?

[JackRobards]

That seems like a good call to me! I've updated the PR to make it a major version bump instead then.

[cloudflare-workers-and-pages]

Deploying tailwind-toucan-base with    Cloudflare Pages

Latest commit:	af83823
Status:	✅  Deploy successful!
Preview URL:	https://b9841d1e.tailwind-toucan-base.pages.dev
Branch Preview URL:	https://jrobards-chart-color-palette-byig.tailwind-toucan-base.pages.dev

View logs

[ynotdraw]

nit

Could expand this slightly so that consumers have a bit better idea of what the major, breaking change is:

Suggested change

	Update new Charts color palette for better accessibility and contrast
	This release contains a breaking change by removing `surface-dash-widget` classes. If you were previously using these classes, there is no replacement. Updated the existing Charts color palette for better accessibility and contrast.

[JackRobards]

Thanks for calling that out - I didn't think to update the changeset message too!

I split this into two separate changeset messages, since that seems to be supported in a single PR.

[ynotdraw]

Excellent idea! I hadn't thought of that route. Thanks a bunch 🎉