Docs improvements, allow setting more stuff outside of articles

config.toml

@@ -62,14 +62,6 @@ primary_color = "#ff7800"
 # Ditto but for the dark theme.
 # If not set regular variant will be used.
 primary_color_dark = "#ffa348"
-# Sets the opacity used for most colors.
-#
-# color_opacity = "0.1"
-#
-# Ditto but for the dark theme.
-#
-# color_opacity_dark = "0.1"
-#
 # Whether to fix low contrast in text selection, checkboxes, etc.
 # Use only if the default doesn't provide enough contrast, e.g. the primary color is set to yellow.
 #