Set default value for 'todo' admonition color across all themes (#2664)

Author: fingolfin

CHANGELOG.md

@@ -9,6 +9,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Now the cursor remain focused on search box even after selecting the filter. ([#2410])
 
+## Fixed
+
+* Don't require custom themes to set a color for the 'todo' admonition. ([#2576])
+
+
 ## Version [v1.9.0] - 2025-03-17
 
 ### Added
@@ -1964,6 +1969,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#2566]: https://github.com/JuliaDocs/Documenter.jl/issues/2566
 [#2569]: https://github.com/JuliaDocs/Documenter.jl/issues/2569
 [#2571]: https://github.com/JuliaDocs/Documenter.jl/issues/2571
+[#2576]: https://github.com/JuliaDocs/Documenter.jl/issues/2576
 [#2577]: https://github.com/JuliaDocs/Documenter.jl/issues/2577
 [#2592]: https://github.com/JuliaDocs/Documenter.jl/issues/2592
 [#2593]: https://github.com/JuliaDocs/Documenter.jl/issues/2593

assets/html/scss/bulma/utilities/derived-variables.sass

@@ -7,6 +7,8 @@ $info: $cyan !default
 $success: $green !default
 $warning: $yellow !default
 $danger: $red !default
+$compat: $turquoise !default
+$todo: $purple !default
 
 $light: $white-ter !default
 $dark: $grey-darker !default

assets/html/scss/documenter/_variables.scss

@@ -15,7 +15,6 @@ $blue: #3c5dcd !default;
 $purple: #9558b2 !default;
 
 $link: #2e63b8 !default;
-$compat: $turquoise !default;
 $text: #222222 !default;
 $text-strong: $text !default;
 $code: #000000 !default;