Review colormap legend functionality

[j08lue]

There are several open tickets regarding color map functionality and UX:

• 885

• https://github.com/NASA-IMPACT/veda-ui/issues/555
• https://github.com/US-GHG-Center/feature-requests/issues/3

Acceptance criteria

• [ ] Triaged these issues and determined whether they are related / should be handled in one bigger change or separately

[faustoperez]

Assigning this to myself, @j08lue

[aboydnw]

Related: WHIS recently enabled the changing of rescale and colormap values: https://water-health-ind.netlify.app/

[aboydnw]

Adding this ticket to the list for consideration: https://github.com/US-GHG-Center/feature-requests/issues/3