docs: add Color Scale docs to Purmerend Theme

[Robbert]

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Name	Status	Preview	Comments	Updated (UTC)
themes	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 13, 2024 2:07pm

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.50%. Comparing base (294aa19) to head (8436147).
Report is 23 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #860   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files          19       19           
  Lines        1334     1334           
  Branches      136      178   +42     
=======================================
  Hits         1194     1194           
+ Misses        140      139    -1     
- Partials        0        1    +1     

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