Document includePaths

Fixes #538

content/en/hugo-pipes/scss-sass.md

@@ -36,7 +36,10 @@ precision [int]
 enableSourceMap [bool]
 : When enabled, a source map will be generated.
 
+includePaths [string slice]
+: Additional SCSS/SASS include paths. Paths must be relative to the project directory.
+
 ```go-html-template
-{{ $options := (dict "targetPath" "style.css" "outputStyle" "compressed" "enableSourceMap" true) }}
+{{ $options := (dict "targetPath" "style.css" "outputStyle" "compressed" "enableSourceMap" true "includePaths" (slice "node_modules/myscss")) }}
 {{ $style := resources.Get "sass/main.scss" | resources.ToCSS $options }}
-```
+```