Updating dicopal

[mthh]

Just a minor suggestion about dicopal: you're using version 0.6.4 and could upgrade to version 0.8.1, which would give you the following without changing your code:

• a new palette (Observable10) for “typo” representation with 10 categories,
• a smaller build size thanks to a more compact palette representation.

In addition, I believe you have some code (here) to generate a palette with more classes than the maximum number of colors of the original palette. Dicopal has the getSequentialColors(<palette name>, <number of colors>) function to manage this directly for you if you want (see https://github.com/riatelab/dicopal.js?tab=readme-ov-file#generating-colors-for-interpolated-sequential-palettes).