✨ Feat: add option disableHeroImageFilter on homepage (#2029)

disableHeroImageFilter deault to false. When set to true, it uses the color
style from the background layout.

exampleSite/config/_default/params.toml

@@ -48,6 +48,7 @@ smartTOCHideUnfocusedChildren = false
   cardView = true
   cardViewScreenWidth = false
   layoutBackgroundBlur = true # only used when layout equals background
+  disableHeroImageFilter = false # only used when layout equals hero
 
 [article]
   showDate = false