fix: adjust world map colors

[christophlingg]

🏆 Enhancements
as discussed in #53 , the world map colors have some issues

• countries whose metric is close to the minimum will disappear from the map (white color fill on white background)
• those countries' border also disappear as the border color is white as well
• countries without any data show up in grey and thus
  • are more prominent than countries with low metrics
  • are not distinguishable with countries with data

this pull requests resolves these issues by

• using a greenish color gradient for countries with data based on http://colorbrewer2.org/#type=sequential&scheme=Greens&n=9
• the hover color for the country and the bubbles are adjusted to match the gradient's green

In theory this changes are an essential improvement over the current change. However, this is my first week with superset and it is not clear to me how to run examples locally and tune colors further. Any hint is more than welcome!

[ghost]

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Happy coding!

[kristw]

There seems to be a build issue (not from your PR) that prevents me from seeing the preview. May have to wait until that is resolved.

[christophlingg]

all right, looking forward to see the preview

[christophlingg]

@kristw is there anythingIi can help to fix the preview?

[kristw]

@christophlingg Please feel free to open another PR to fix the build. I am out of bandwidth at the moment.

[christophlingg]

@kristw all right, I will have a look. can you point me to the right places to not start from zero?

[kristw]

Please rebase

[ghost]

There were the following issues with this Pull Request

• Commit: b15ea80
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Happy coding!

[codecov]

Codecov Report

Merging #215 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #215   +/-   ##
=======================================
  Coverage   34.25%   34.25%           
=======================================
  Files          12       12           
  Lines         216      216           
  Branches       21       21           
=======================================
  Hits           74       74           
  Misses        132      132           
  Partials       10       10

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[netlify]

Deploy preview for superset-ui-plugins ready!

Built with commit b15ea80

https://deploy-preview-215--superset-ui-plugins.netlify.com

[christophlingg]

Changes look pretty good to me: new vs old

@kristw